On 3rd feb I had unprotected sex but just for 10 sec I did not ejaculate inside her and next day on 4 feb she took ipill. On 18 feb she got her period for 5 days but in month of march she did not get her period we did not do anything later on we tested and it was luckily negative and now in month of april she got her period from 18th april for 15 days. Can she be pregnant? We are worried. And does ipill is effective to any age whether it be 16-17?