Please help Health issue

Alexus
I've been experiencing different stomach pain for the past week now..the first couple of days I felt like it was indigestion because I felt acid in my throat but the. It changed to pain and cramps..it would stop but occur again..I've been having a hard time trying to go to the bathroom..I feel like I have to force myself more like constipated..but I did have sex on the 17th of this month so I'm worried? So now I'm waiting for my monthly friend to come.