Could I be pregnant?

My boyfriend and I had unprotected sex and he didn't finish in me. I took plan b just to be safe and I don't know if it was my period but I was bleeding for 4 days. A week later we had unprotected sex again but I didn't take plan b. He didn't finish inside of me. I haven't gotten my period or feel like it's coming. Do you think it was my period that I got for 4 days only? Could I be pregnant?