Pain in the lower right abdomen, slightly above the pelvis, was strongest when having relations with wife, hasnt occurred before, lasting 3 days now?

Right lower abdomina: This could be a strained abdominal muscle, but appendicitis would be a concern if there is persistent right lower quadrant abdominal discomfort, especially if the area is tender to touch. An examination by a physician or surgeon is recommended if symptoms persist.

Agree with Dr. C.: If you have fever in addition to the pain, go to the emergency room of a nearby hospital.