Please help...

Alright. This is gonna sound crazy. But I need help on what to do. My boyfriend and I had sex last night and ever since I’ve been having pain in my pelvic bone anything I move. Not bad pain. Almost like pressure on my pelvic bone from the inside trying to push out. It’s also painful when I do try to push it out. It’s almost the same sensation as gas, but in the front. What do I do? Should I seek medical attention and make an appointment? Should I go to the hospital? Sit it out and see what happens? This has never happened to me so I’m pretty freaked out.