A member asked:

How long after stopping progesterone supplements will period start? been 5 days. neg hpt. awaiting period to start clomid (clomiphene). ttc. how long is too long?

A doctor has provided 1 answer

Half life and cycles: Synthetic progesterones have a longer half life than natural progerstones but usually around 25-50 hours. However, menstrual cycles can variably start 3-5 days to weeks after stopping.

Answered 5/17/2014

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