CD 67......

Went to obgyn last Friday gave me Clomid 50mg said take when I start af.... he knew I was like 29days late and said I probably didn't ovulate he said if I didn't start AF in a few days (from the day I went) that I need to keep testing even though I've been getting negative tests last on was the day before I went to Dr.... why havnt I started?!?! Can't test til Friday..