Does progesterone pills affect healthy pregnancy?

I had a miscarriage before, and was prescribed progesterone pills by my gynae during my second pregnancy, started taking the pills at 4 weeks (now at 6 weeks). However, gynae did not do any blood tests before prescribing the pills. In the event I don't suffer from low progesterone levels to begin with, is there any harm to taking these progesterone supplements? #pleasehelp #advicepls #firstbaby