Is this normal?

Okay sooo last night I did anal for the first time, I’ve always been super curious and wanted to try it and it went WAY better than expected. Lots of lube was used, there wasn’t much preparation I’ll admit and I wasn’t fully relaxed (because I was still scared and nervous) but he did try to make me feel relaxed and gave me assurance when needed. After a couple minutes of pleasuring myself during it he went a little harder and we stopped after that because it hurt and everything was perfect after we stopped. I woke up today and it feels kinda like I’m constipated and I have like not pain but a uncomfortable feeling in my lower stomach. Is that normal after doing it for the first time? I’m sorry I’m just so new to this 🫣