Progesterone supplement success?

I'm only 5 weeks along.  Second pregnancy. We have 2 year old twins :) wondering if anyone could share a success story with me.  My progesterone levels are a little low. Hcg  levels are good.  Started progesterone supplement yesterday.  Have to wait until September 9 for ultrasound.  Anyone had to take supplements early on and everything turned out great?  :) I know it's kind of common, I could just use a little boost that it's probably fine :) :)