Am I worried for nothing?

So my husband has recently lost 60 pounds and ever since his sex drive has gone WAY up. Like we have sex daily now sometimes twice a day. Before he lost weight it was like once every week or two. He finishes inside of me every single time but I am on the birth control pill and have been for 9 months. I'm not used to us having this much sex so I guess I am a little paranoid I will still get pregnant. Is there any chance that's possible or am I safe no matter how many times he finishes inside of me?