worried

so i’m on the pill and i got my period “on time” with the pill and it lasted the normal days and the last time my bf and I had sex was earlier this week with condoms twice but I have been on antibiotics but they aren’t the ones on the known list that counter act with birth control. my mom says i’ve been sleeping a lot and I was constipated today & the other night I had an excruciating upper stomach pain and nausea but I also took two plan b’s a couple weeks ago after some accidents (i’ve learned from it and I know it’s bad but I am a very paranoid person) but big question here is could I be pregnant? I also forgot to mention that I just came back from a week trip in europe so could that be the explanation to the often sleeping and getting tired early linked to jet lag?