what could this pain be from?

so i started on seasonique a few weeks ago, and i was off my medication for a few months before i got my perscription changed, because my old birth control was making me sick. but i notice that off and on i get a twinge of pain in my left lower pelvic area, sometimes in my right lower pelvic area, it hurts, i made an appointment to see my doctor, but ended up having to cancel it because i had to work. but now i'm afraid to call and schedule a new one because my doctor is so booked up, the next appointment is not available until september. i want to go to urgicare but i'm afraid that the doctor will dismiss it as nothing and send me home. what could this pain be from?