Bleeding/ Spotting Susceptible

7 Weeks today. For the last 1.5 weeks I have been spotting/ bleeding. Been to the doctor twice, both times baby is in there with a heart beat measures right on track. But for some reason I’ve been having spotting and times of moderate bleeding, going dark red to brown.

My doctor seems stumped and said I may just be susceptible to bleeding.

Anyone else been told this or had issues with bleeding but a progressing pregnancy?

Going to the bathroom now is so stressful, which stinks cause it’s quite often.

My last pregnancy which ended at 15 weeks due to pprom, I did spot the first 9 weeks. But it was always light.