Spotting at 20 weeks??

Sarah
I never know if I should worry or not about things during this pregnancy. I'm a FTM. I had spotting at like 9 weeks for like 10 days and it was a subchorianic hemorrhage. Spotting again a few weeks later and it was either the same hemorrhage or a new one. Relatively small tho. Had spotting again maybe around 16 weeks and they found I had a low placenta. A few weeks later they did a repeat ultrasound and it was no longer considered low. But now this spotting is more brown. Very light but I don't know what it could mean. Anyone have this??