Bleeding 8 weeks

Je

I had some very mild bleeding around 5-6weeks (only when wiping and dark brown) but this morning I had quite a bit of blood when wiping followed by several other wipes without a tinge of blood. I went to see my doctor who had me do another ultrasound. Saw baby’s heartbeat it was at 138 bpm and my cervix was closed. They can’t seem to figure out where the bleeding is coming from but asked that I return home and try to rest. Have any of you mommas experienced this and went on to have a health pregnancy? This is my second baby and I didn’t have this with my first. I had a miscarriage in October at 5 weeks. Kind of scared tbh. Prayers please ❤️🙏