During sex

My bf and I were having sex with a condom. I’m also on the pill for extra protection. He always pulls out when he knows he’s gonna cum into the condom.

Today, I noticed white liquid dripping down his balls. He says it’s from me and I kinda believe him because I saw his cum in the condom. Just wondering if this is normal or possible? I’m freaking out thinking his cum may have slipped from the ring of the condom.