20. I am 20 days late. Negative tests. And last week (Tuesday) my doctor did a blood test and... BFN. I have no symptoms at all. She said if I haven't started by the end of next week to come back. But I'm so confused. I've never been late. If anything, I'm ALWAYS early and I have ALWAYS had terrible, heavy periods. I'm not even spotting or cramping. Usually my periods land me in the hospital because I have endometriosis and the pain causes me to black out. I started my period March 6-11. Not a lot of bleeding for me but what others would consider a normal period. I also started Metformin and Clomid. Has anyone who took clomid had a delayed period the next cycle? I'm  so confused and scared. Please help....