Maximum Delay in Periods After Taking Unwanted 72

Quick answer: A delay of up to 7 days is normal after taking Unwanted 72. If your period is more than 7 days late, take a home urine pregnancy test with first-morning urine. If it is negative and the period still does not arrive by Day 14 of delay, see a gynaecologist for a repeat test, a serum beta-hCG, and a transvaginal scan.

"Ma'am, I took Unwanted 72 three weeks ago and my period hasn't come. Should I worry?" This is the single most common emergency-contraception question in my Egmore and Mylapore clinics. In this article I will walk you through exactly how many days of delay is acceptable, why it happens, when to test, and when to come in.

What is Unwanted 72?

Unwanted 72 is an emergency contraceptive pill that contains 1.5 mg of levonorgestrel — a synthetic form of the hormone progesterone. It is taken as a single tablet within 72 hours (3 days) of unprotected intercourse to reduce the chance of pregnancy.

It works primarily by:

1. Delaying or blocking ovulation — the main mechanism when taken before the LH surge
2. Thickening cervical mucus — slowing sperm travel
3. Making the endometrium less receptive — if ovulation has already occurred

Because its main action is hormonal, it will disturb your next period — that is not a failure, it is simply how the drug works.

Can Unwanted 72 delay the menstrual cycle — and by how many days?

Yes, a delay is expected. Here is the pattern I see in my practice:

• 0–3 days delay: very common, completely normal
• 3–7 days delay: within the normal range — no test needed unless symptoms appear
• 7–14 days delay: take a home urine pregnancy test with first-morning urine
• More than 14 days delay: consult a gynaecologist. Repeat urine test, consider a serum beta-hCG, and a transvaginal ultrasound

Published data tells us roughly 13% of women who take a levonorgestrel-based emergency pill experience a delay of more than 7 days. In about 1 in 20 women, the period may come earlier than expected rather than late — also normal.

Why the delay happens

Levonorgestrel pushes ovulation forward. If you were due to ovulate on Day 14 of your cycle and you took the pill on Day 11, ovulation may shift to Day 17 or later. Since your period comes 14 days after ovulation, the whole cycle effectively moves by 3–5 days. Layer on top of that the normal variability of the endometrial lining, and you get the 0–14 day range that I see clinically.

When to take a pregnancy test after Unwanted 72

My clinic rule:

1. Day 21 after the unprotected intercourse — first home urine pregnancy test with first-morning urine. This is early enough to catch most pregnancies and late enough to avoid false negatives from too-early testing.
2. If the period is more than 7 days delayed and Day 21 has passed — test if you haven't already. Repeat 48 hours later if the first is negative.
3. If the period is more than 14 days delayed and urine tests are negative — come in for a serum beta-hCG blood test (more sensitive) and a transvaginal ultrasound.
4. If the test is positive — do not take a second Unwanted 72. Book an early pregnancy dating scan at around 6 weeks from your last menstrual period to confirm the location of the pregnancy.

Other types of emergency contraception (so you know your options)

Unwanted 72 is not your only option. Here is what is available in Chennai:

• Levonorgestrel pills (Unwanted 72, i-pill, Pill 72, Norlevo) — 1.5 mg single dose, effective up to 72 hours. Most widely available.
• Ulipristal acetate (Ella, Ella-One) — 30 mg single dose, effective up to 120 hours (5 days). More effective than levonorgestrel in the later part of the window. Prescription-only in India.
• Copper IUD (Cu-T 380A, Multiload) — the most effective emergency contraceptive available. A gynaecologist can insert it up to 5 days after intercourse, it is over 99% effective, and it becomes your long-term contraception for the next 5–10 years.

If you are repeatedly relying on emergency pills, please talk to a gynaecologist about a copper IUD, hormonal IUD, or a daily contraceptive pill — all three are gentler on your body and more reliable.

Unwanted 72 and i-pill — are they the same?

Yes. Unwanted 72 and i-pill are the same drug — 1.5 mg of levonorgestrel — sold by different companies. Equally effective, equally safe, same side effects, same 72-hour window. Patients sometimes ask me if one is "stronger" than the other — neither is. Buy whichever is available at your local pharmacy.

Side effects of Unwanted 72

These are the side effects I counsel my patients to expect. None of them are dangerous on their own, but they can be uncomfortable.

1. Nausea and vomiting

The commonest side effect. Levonorgestrel can irritate the stomach lining, and the high single dose pushes many women into mild nausea for a day or two.

Important: if you vomit within 2 hours of taking the pill, the dose was not absorbed — you need to take another one.

2. Fatigue and headache

Mild to moderate headache and a feeling of heaviness or tiredness for 1–2 days is normal. Stay hydrated, rest, and a simple paracetamol is safe if the headache is uncomfortable.

3. Breast tenderness

The progestin surge can make your breasts feel sore, fuller, or tender — similar to PMS. Usually settles in 2–3 days.

4. Abdominal cramps

Mild lower abdominal cramps are common, especially in the week after taking the pill. If the pain is severe or one-sided, that is a red flag — come to the clinic.

5. Changes in bleeding

Your next period may be lighter, heavier, earlier, or later than usual. All four patterns are possible in the cycle after Unwanted 72. The cycle after that usually goes back to normal.

6. Spotting or breakthrough bleeding

Some women notice pinkish or light brown spotting a few days after the pill. This is withdrawal bleeding, not a true period. Track it on your phone app so we can tell it apart from your next real period.

Warning signs — see a doctor the same week

Please come in urgently if you have any of these:

• Period more than 14 days late with negative home tests
• Severe one-sided pelvic pain — must rule out an ectopic pregnancy
• Heavy bleeding (soaking more than one pad per hour)
• Fainting, dizziness, or shoulder-tip pain with the bleeding
• Positive pregnancy test with cramping or bleeding
• Vomiting within 2 hours of taking the pill — you likely need to repeat the dose
• Weight over 70–75 kg — levonorgestrel is less effective at higher body weights; a copper IUD would have been a stronger choice

Does Unwanted 72 affect my future pregnancy?

No. Levonorgestrel has been studied extensively for over 40 years. It does not affect future fertility, does not damage the uterus, does not cause miscarriage in a later pregnancy, and does not cause birth defects if you are already pregnant when you take it (though it will not work in that case either).

What it does do is disturb your current cycle, and — if used repeatedly — make your cycles progressively more irregular for a few months. That is why it is called emergency contraception. It is not meant for routine use.

When to see me

Please book an appointment if:

• Your period is more than 14 days late after Unwanted 72
• You have severe pelvic pain, especially on one side
• You have unusual bleeding patterns that do not settle in 1–2 cycles
• You took Unwanted 72 more than once this month
• You are using emergency pills more than 2–3 times a year
• You have a history of irregular cycles, PCOS, thyroid disease, or diabetes

You can book an appointment at my Egmore clinic (morning 8 AM – 2 PM), at the Mylapore branch for an evening slot (5 PM – 9 PM), or at Tambaram on Thursdays and Sundays between 2 PM and 4 PM.

Related reading

These are the articles my patients usually ask about next:

• Does bleeding after taking i-pill mean no pregnancy? — the withdrawal bleed question, explained clinically.
• Is Unwanted 72 harmful for future pregnancy? — the long-term fertility question.
• Difference between white discharge before period and pregnancy — if you are unsure whether your late period is just a delay or something more.

For a fuller overview of contraception and early pregnancy care, see my obstetrics care page.