My wife's have last period is 16th March. We have doing unprotected sex on 19th March and after that she take I pill on that day. On 26th March her period is start for one day. On 30th March again her period start for the half day. Her period didn't start. Today she will check her pregnancy with prega news and result is negative and we have again unprotected sex today. Is there any chance to pregnant? Can she use again I pill? When she get her period?