Progesterone?

So my doctor ordered labs last week and they called me back today stating my progesterone levels are low. And it has me freaking out so much. They prescribed me progesterone and I start taking it tonight.

I’m 7wks 2d. Ante one get prescribed progesterone this early on and had a wonderful successful pregnancy? Because I’ve already had one miscarriage I can’t take another one so soon :( my hcg levels were doubling and increasing and everything else looks great. Strong heart beat when I had my sono last Thursday

I just don’t want anything to happen to this baby :(