HELP! condom slipped off and I have a month old son

Freaking out. So I just had my son last month on the 6th and my boy friend have been having sex every now and then and yesterday we had sex WITH a condom but we didn't notice until we were done that it had fallen off and was stuck inside of my all the way up near my cervix... he came and it was on the condom so I'm freaking out. How likely is it to get pregnant again right after you have a baby!