I am wondering if I can get pregnant while taking Relefin Or Nabumrtone? I have been on these for several months and not had my period on a regular basis i think its because of these but my doctors do not when i discuss this with them and i have taken many pregnancy tests but all say negative why could this be? I am taking folic acid and pre natal vitamins Can you shed some light on this subject! These are anti-inflamatory medications. I have tendonitis or valgus, i guess.