Light brown spotting for a few weeks

Ca

It goes away, didn’t have it for a week and now it’s back. I had of on the weekend with severe cramps but went in Monday for an ultrasound and baby is there with a strong heartbeat and measuring exactly where it should be. They found a tiny possible subchorionic bleed which they told me to not do any intense activities. I went to work today for the first time this week and after work had intense spotting again. No heavy lifting for work just lots of walking around the hospital. Anyone elS experience light brown spotting off and on? I’m 7 weeks 1 day and saw the baby with a heartbeat at 6w5d