I had it with my daughter and it moving caused bleeding

It's a hemorrhage between the baby and your uterine wall it causes pain and bleeding sometimes a lot sometimes a little. I had one from 6 weeks to 14 weeks they can usually subside on their own but sometimes if it's big enough like my friend Natalie's was it can cause miscarriage she was due two days after me and she lost hers but I'm in my third trimester

I had that with my middle son and never bled I know the last two times it happened they said it was implantation bleeding @marskhaos

Also have them see if you have partial placenta previa( placenta could be moving causing bleeding)

What's that @amanda_turner

Ask them to look for a subcnrionic hemorrhage or however you spell it