Periods are late can she be pregnant?

Hello doc! Its going to be almost 2 months since my gf didn't got her periods. Since we intimated and in anxiety she took 2 I-PILLS we intimated on 20Jan 2019 and it was not totally intimation but we thought by chance my sperms would have gone in her vagina through my fingers and she took her first pill on 21st night around 8:30pm and on same day we again did but this tym wid condom and just rubbing outside again she thought same and took another pill on 22Jan at 8 or 9 pm then didn't get her periods but she had some bleeding on 31January and it continued for few days after that she didn't had anything like that and this months periods are still not coming she even started taking period enduring pills from 5-6 days she is an PCOD patient doctor. And also first time she did 3 pregnancy test through kits but it was negative and again on this month on 9th she did another test it was also negative. plz doctor help us.