Chances of pregnancy. Please guide.

Hello doctors, Me and my fiance had protected Intercourse on 18th Feb when her period date was 27th Feb but we both were confused so she took unwanted 72 on 20th and then on 3rd March she got her bleeding for two days she usually bleed 2 days in period and on 3rd day she have very light bleeding. Than again on 2md April she got bleeding for 2 days and no bleeding on 3rd day her all symptoms was like regular period only stomach pain before period and false discharge. Now on 8th may she again got her bleeding but this time bleeding was for 3 days in which first two days was heavy bleeding. Her period cycle is usually irregular. Is there any chance of her getting pregnant we both are worried. But all her symptoms and timing of bleed is like regular bleeding. But first time in last 6 months her stomach is paining on 5th day also. Please guide.