Progesterone worries

5th pregnancy here after 2 back to back miscarriages. I am currently 10 weeks and 5 days. I am done taking my 400mg of progesterone a day in 2 days (basically at 11 weeks) and I feel like the only reason I haven’t miscarried this time is because of the medication and once I stop taking it, I’m going to lose my baby. Please tell me I’m being irrational and everything is going to be ok? I have been so cautious with everything. I feel like my anxiety is going to go through the roof once this medication is done.