Progesterone delays the cycle?

My doc prescribed me progestérone (vaginal administration) from CD 15 until a positive test or until my cycle comes. I made 2 test with vvvfl on 10DPO, the day after I made blood analyses and my hcg level was negative. I made an opk positive on the 10th September and I feel ovulation pains on the 11th of September. I stopped progestérone on the 20th night because on the 21th my hcg level was negative but I don’t have my period... it was due since 2 days!

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