Hi Can I Ask You A Question?my Name Is Shalimar

Hi can I ask you a question?my name is Shalimar I've been with my husband for 8 years now we've been married for 4 years now we have a son together he is 3 years old and just recently two weeks ago we had intercourse and I started to bleed I thought it was normal but we had intercourse again yesterday and I started to bleed again it's not heavy blood it's very light pink but I am very scared. I got my period on December 25-30 and it was normal. What do you think is causing the bleeding?