I Had Sex For The First Time Last Wednesday. I

I had sex for the first time last Wednesday. I had just gotten off my period the day before. We used protection, and also he could barely even fit in me so he just gave up and fingered me. I have been feeling bloated since and I cant figure out if im just scaring myself because of it or if I should be taking a pregnancy test or what? I took a Plan B pill 4 days after but i still don't know. please help..