The Other Night I Had Lower Belly Pain Which Woke

The other night I had lower belly pain which woke me from my sleep. I thought it was gas, but a couple minutes later I felt a sort of "pop" in my right lower abdomen/pelvic area which hurt a lot. I have had a dull ache/soreness since then. I made an appointment with my primary care doctor, but is this something I should go to the ER for right away? My appointment isn't for another couple days and while I feel perfectly fine except for this very dull pain, my family is worried and want me to go in immediately.