I had terrible mad cramps after sex

precious

Hi everyone. This has never happened all my life. I had sex with my boyfriend. After the sex. I had this terrible pain in my lower abdomen. I couldn’t even stand up. And sitting down with my butt. I will feel some weird pain. My lower abdomen is on fire. So the next day I left with my bike 🚴. And I feel okay then till I come across a bad road and bumpa it wasn’t really easy and I feel the pain again. Please is there any suggestions or what really happened that day. Thank you