What Causes Lower Abdominal Pain During Pregnancy?

My pregnancy is 23 weeks 4days . scan saidthebaby is longitudinal withcephalicpresentation. I feel a right sided lowerabdominalpain thatextends to my limb causing swelling and difficultyto walk sit or stand. No vaginal discharge. No bleeding. Have had appendicectomy 9years ago but thedoctor sdiagnosissaid salpingitis. Don t you think it s just an ordinary pain thatrequires a small pain reliever? Chinasa