Could this be pregnancy?

Eden
I'm on the birth control pill and have been for two years. I was sick during the week of my period with strep throat and given Clarithomycin and took it for 10 days twice a day alongside my birth control pill. My boyfriend and I had sex two days after my period ended and we didn't use a condom, however, he pulled out. 
I've been having cramps and bloating since then. I'm not sure if it's coincidence but I'm worried the antibiotics messed with my birth control. Should I be worried?