Progesterone

Hi there. I had a miscarriage/stillbirth from PROM and a prolapsed cord at 16 weeks with my first pregnancy in 2014. We've been ttc so much since then. Well, we finally got a BFP!! Come to find out it's more of a medium fat positive. I have to get my HcG level retested and they said my Progesterone is low as well. I have to start some vaginal pill until 12 weeks. Has anyone had experience with this? I'm trying to gauge if I should be as upset as I am. I'm also concerned because my ultrasound would put me at 7-8 weeks and last year my OB talked about putting a stitch in my cervix to strengthen it, but we're not sure how accurate my date is yet.