Curious

I had bright red bleeding and tiny tiny clots. Went to er but the bleeding stopped after 10 minutes and they did a pelvic exam and my cervix was closed and they didn’t see any clots or blood they heard tried with an old Doppler and heard faint heart beat. But she said it was still beating. And that it was not a miscarriage I’m 10 weeks 5 days. And there was also no cramps. It started right after I put in the vaginal progesterone suppository could taht have been the cause ?

I’ll also add that I had a ultra sound and baby was perfectly normal with heart rate at 170. 2 days before this all happened I have t had any bleeding since.