Prescribed 50mgs of Clomid (clomiphene) and labs confirmed ovulation. I had colposcopy done a week ago. Over 5 days late, neg pregnant test. Why haven't I started?

Maybe pregnant. If ovulation happened you have to either start or be pregnant. If ovulation was late it may take a few extra days for a pos test. Run first morning urine. Sometimes a persistent corpus luteum (ovulatory cyst) can delay your period. Hope you're pregnant.