Could I be pregnant?

So on the 13th I had unprotected sex he pulled out but Idk if he did fully so I took a plan b just Incase. Now almost a month later my period is 2 days late I kept getting mild cramps if I exercise but no period and I’m always feeling nauseous and dizzy but I don’t think I could be pregnant I might just be paranoid even though I have all the signs what do u guys think?