Could my daughter be my boyfriend's kid.

So i was seeing a guy and i used the plan B and then like maybe 3weeks after that I met my boyfriend now and then in july i believe that I became pregnant and when I was at the drs they said that I was 7weeks along. I started dating my boyfriend on February 2016 found out pregnant on july 23rd 2016 was 7weeks and had a due date of march 3rd but had baby at 38weeks February 22nd 2017. Im just curious