<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doc..My wife has missed her periods by 2-3 days this month..we had an unprotected sex on 22nd may 2013, she took an i-pill on 23rd may 2013. Her period cycle is of 28th every month..today morning we had tried CIPLA PregTest that came negative Only 1 pink line on C. Can i-Pill delays the periods? By how many days approx? Is she pregnant?  <response>: Hello, Taking I-pill within first 24 hrs of unprotected sex gives protection more than 95 against unwanted pregnancy. Following taking I-pill, period may be delayed for 7-10 days in general. It occurs due to hormonal imbalance and mental stress. You did sex mostly around safe period and got negative pregnancy test. Here, she waits another 1 week to get period normally. Otherwise, consult with gynecologist for proper medication to induce period. Take healthy diet, Chat Doctor. Be well practice safe sex in the future. 