Stomach Pains

So, about two weeks ago I woke up with crazy pains in my stomach. Wasn't cramps or "sickness" pains, but felt like I had been doing ab workouts for about two weeks straight. I took pepto bismol throughout the day and eventually they subsided. A few days later I got my period, as expected. Every since the initial day of pain, however, I have had a lingering soreness/ache in my stomach muscles - primarily my upper stomach. I'm just wondering if this sounds familiar to anyone. 

I'm on birth control and have been with my boyfriend for 3 years now, we don't typically use condoms. I'm due to start my next period in 10-11 days or so.