Talk to Gynecologist on Hematoma Detected During Ultrasound

Hi, I am currently 25 weeks pregnant. I had bleeding during 3rd month that stopped with treatment followed by some incidents of spotting that also stopped. During 22w i got my anomaly scan done and there is a hematoma of size 21 ml, all else is fine. i want to ask how safe is physical activity with this since i was on bed rest from 1.5 months. Also how much time will it take to resolve ideally. Is this size considered small or medium with how much risk. If it goes away there is a chance of it coming back.