I and my gf had protected sex on 30th December using a condom and I didn't ejaculate while I was inside her but just to be safe she took an Ipill and she got her period between 2nd and 4th January which was the exact time she had to get the periods and lasted for less days than usual although her periods are usually late by 2 or 3 days..now her next period is delayed by 11 days as of today.. Is it a normal side effect? Please help