What Causes Abdominal Discomfort After Taking Plan B?

I had sex with my bf last night /early this morning and the condom broke and he already came inside of me... it was the second time he came that night, the first was like a half hour or so prior to. we ended up going to get the plan b pill bc im not on birth control right now. I took it about 5 Hrs ago and my stomach gets these weird bubbley feelings almost like gas but its not... I am pretty sure my ovulation process us over and I'm due to start my period in about a week and a half. is the bubbley feeling normal? could I be pregnant?