How does an orgasm feel?

Ok so the other night me and my bf were having a good time if you know what i mean 😏. So i was on top riding his dick like theres no tomorrow lol. Im living my best life at the moment. I was really gaining momentum. I was REALLY enjoying it. Then i suddenly feel like i need to go to the bathroom. I cant really explain how it felt it didnt really feel like i needed to pee it kinda felt like i needed to poop but it didnt at the same time. (We werent doing anal).like my down stairs area was getting relaxed. I really dont know how to explain it. Idk what that feeling was so i got scared that i was gonna shit idk lol. So i stop riding his dick and then he took over. I felt this feeling before and i always stopped myself because i was always afraid. I dont think i was gonna squirt because i always heard that it feels like you need to pee. But i don't think i got that feeling. Like it just felt like it was letting loose and relaxing downstairs Idk. Lol i havent orgasm yet. My bf is my first so i dont have much experience. So what was i feeling?