Provera & clomid symptoms or pregnancy

Has anyone else ever experienced nausea & breast tenderness after taking provera and clomid? I just finished my 3rd round & haven't ovulated according to the home ovulation test but I have felt awful for three weeks straight with breast so sore that I can barely wear a bra & this morning nausea began... Is there any possibility I am pregnant? I took a test around two weeks ago & it was negative..