Delayed periods. Effect of the medicine?

Me and my gf had non penetrative sexual activity on 1st february.. FYI.. before that day she had her periods on 21st of january.. now at 2nd february i gave her unwanted 72 because there might have been a chance of my precum touching her parts while i was fingering. On 18 th february she had her periods, and she did not show any withdrawal bleeding before that.. she had her normal periods for around 5 days.. after that we did not have any form of sexual activity where my sperms can touch her vagina.. but it is 22nd march and it has been around 32 days and she is still not having her periods.. she says that sometimes it feels she is having a little bit pain in her abdomen.. which she feels before having a period.. but thats the only thing thats been happening with her for past few days.. is there any chance of pregnancy.. provided with the above situation?? and is the delayed period an effect of the medicine??