I Took Plan B Two Weeks Ago And Recieved My

I took plan b two weeks ago and recieved my period a week later a few days later than expected .. Two weeks later I had another scare and took another pill but earlier in the day and the night before I took the second pill I started getting stomach pains and felt nausea .. Is this just late symptoms from the first plan b ?and now after taking the second one my stomach feels the same/worse. I had sex on the 8th day of my cycle in a normal 28 day cycle so it was a day before my first fertile day and 6 days before my supposed ovulation date