Feeling like I need to poop during sex?!

So today I had my first time (ever).

My boyfriend was going slow for me so that it wouldn’t hurt too bad, and it went as expected, but the further he went in, the more I felt like I had to poop ya know?

I was just wondering if this was normal. Idk if it’s because my period is due in like a week, or what but I was just curious if anyone has any explanations or anything on this because I’m worried that there is something wrong with me because i felt like that, and It didn’t hurt that bad, but it didn’t feel good how people talk about it being so I just didn’t know

Please respond it would help me a lot!