First round of clomid and now on cd20 and haven't ovulated.

Hello, I'm new to this group. This is my first round of clomid. Took 50mg cd 4-8 of cycle. I have always had regular periods and have always ovulated. I've had 1 ectopic and 1 miscarriage. I started testing with the clear blue advanced digital on cd10, I got 3 negitives and on cd13-20 (which is today) I've have had the damn flashing smiley face. 8 days!!!! Which means high estrogen but yet have received the solid face. I've used these before and never have had this happen. Anyone ever have this happen?