Low progesterone :( need advice


Hi everyone. I'm terrified I miscarried back in January and am pregnant again. We still don't know how far I am but I go for an ultrasound today and I suffer from low progesterone. I'm terrified that the ultrasound is not going to be good. My doctor just put me on the progesterone vaginal insert pills. I started last night. Has anyone had experience with these pills? Did they work? Or am I too late.