I had sex with my gf and gave her i pill and again in the same month we had sex and again given i pill.. but it will little bit late like more then one day after sex and some days later she had period twice in that same month after taking the i pill second time, now this month her period did not came still, as she actually had period first week of the month.. her second period during the last month was on the last week.. what is the reason? Is it a change timing  of period  or is she pregnant