Question about cumming in condom

Eliza

I am naive and was taught nothing about sex. My boyfriend came inside me for the first time tonight and we were using condoms, but he didn’t pull out like normal bc we were both getting off at the same time. Ugh. Which was great in the moment but then I looked down and it seems like some cum was at the base on him (I was on top) and he said it was probably just me - not his cum - but I still was so paranoid I took PB :( Thoughts? Encouragement? What is “normal” like does all the cum stay inside the condom, even when the girl is on top or is it going to be outside and leaking like…is it possible that I have fluid that was on him from me? I don’t know how to even learn about this.