<s>[INST] I had sex with my fiance right after her period. And 2 days later she took postinor 2, she complained of stomach pains and drowsiness a day after then 5 days later she had vaginal bleeding. She is supposed to see her menses on the 28th but still hasnt seen no sigh of it. Is she pregnant? or just side effects of the drug? [/INST] Hello, I would be happy to help you with your question. The initial bleeding followed by the delay in her period is almost certainly related to the medication that she took.  While it is very effective, it is not 100%.  She should expect a week or two delay in her period, but should also check a pregnancy test weekly for at least a couple of weeks to rule out pregnancy. I hope that this helps and good luck! </s>