Is it still possible ?

Kaitlyn

So i missed my period on September 11th it has been 13 days late and me and my boyfriend assumed i may be pregnant but i didn’t take a pregnancy test yet because i was going to take it tomorrow morning with him but today i experience some light bleeding so i guess my period decided to come. But during those 13 days we had sex twice and he didn’t pull out , it is still possible that i might become pregnant from the other days we had sex ?