Lost need some advice

I rook clomid August 10-13 and I am currently 2 days late with getting my period. Ive taken 3 tests all negative. Have had some symptoms but nothing major. I've had some nausea, mood swings, being very exhausted, and even my boobs feel different. I go to the doctors Wednesday for more blood work and even then it feels so far away... I just don't understand why I don't have my period and keep getting negative tests.