Lower right abdomen pains 2 weeks before period and 3 days after unprotected sex could i be pregnant?

Hard to guess: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon and thus lead to a repeat test. Of course, there are many other causes of lower right abdominal pain that a doctor can evaluate.