Pregnancy Scare. Doubtful. please help?

Hello Sir/ mam, Just for your reference here is the brief history. My period in January was from 22nd to 27 jan. 28 jan night- Had sexual encounter with genital rubbing no ejaculation only chances of precum. 29 Jan Morning - took Ipill as precaution. 7 Feb-Got early withdrawl bleeding which started light and dark but later got normal and red. DID NOT HAVE ANY PERIODS AFTER THAT FOR 2 and HALF month Until 25 APRIL 25 April -Got periods which lasted for 2 days with normal bleeding.Had to change pad only 2 or 3 times in a day. I am thinking of getting herself checked for long periods as her earlier periods had been for more than 40 days. Before that I just want to confirm given the chain of events is there a possibility that I can still be pregnant as i have been feeling weakness sometimes and nausea too so getting doubtful. Please help