Progesterone supplements (prometrium)

I’m taking prometrium vaginal suppositories twice a day due to my previous early losses. I’m worried that the prometrium will hide a miscarriage if I’m having one and I won’t find out until my first ultrasound. From what I know, it stops you from bleeding, so could an inevitable miscarriage just end up lingering until I stop taking it? Anyone have any experience or know anything about this?