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Does i-pill prevent pregnancy during the ovulation phase?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

My girlfriend got her period 15 days back, and yesterday we had unprotected sex where I released inside her (ovulation phase). After knowing this, she had an i-pill just one hour after sex.

Is there still any chance that she can get pregnant?

Kindly help.

Hello,

Welcome to icliniq.com.

I read your query and can understand your concern.

The right thing you did was give the i-pill (Levonorgestrel), which is an emergency contraceptive. Taking it within one hour after unprotected sex provides very high protection, around 95 to 99 % effectiveness.

However, since you mentioned your girlfriend was likely in her ovulation phase, here is how to understand the situation more clearly:

The i-pill mainly works by delaying or preventing ovulation. If she had already ovulated and the egg was released before taking the pill, the i-pill cannot stop fertilization that might already have occurred. If ovulation is yet to occur, the pill will likely prevent it, thus preventing pregnancy.

Since it was taken within one hour, the protection is very good. But because it was around ovulation, there is still a slight chance of pregnancy, roughly five to 10 % or less, depending on her exact cycle timing.

What you can do now is wait for her next period. It might come a few days early or late due to the i-pill’s hormonal effect. If her period is delayed by more than seven days, or is lighter or shorter than usual, do a urine pregnancy test about three weeks after the unprotected sex. Avoid using the i-pill frequently, as repeated use can disturb her cycle and reduce its effectiveness over time.

I hope I have answered your question.

Let me know if I can assist you further.

Regards.

Medically reviewed byiCliniq medical review team

Published At January 26, 2026
Reviewed AtJanuary 26, 2026

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