hi my name is jennifer i had the same problem but i was on the shot and ive been off it for 2 and a half years noe i been haveind pains to but on bothside and hurts when having sex. the pain starts rite before my pms comes u mabe have an infection go to ur gyn doctor they gonna give you anti pills it will help
it is unlikely it is pregnancy but it seems it is something to do with the congestion that is causing the discomfort. get an ultrasound examination of the abdomen done. also you can get the urine pregnancy test done to know the status of the pregnancy.