M.O.
I would get to the doctor's office right away. Your lower right side could mean your appendix...the last thing you want is for that to rupture.
It also could be an ectopic pregnancy, which could also rupture, your fallopian tube.
I hope I'm not scaring you too much, but stabbing pain is nothing to ignore. Get into the doctor's office and have them check it out.
Best of luck - let us know what they say.