Spotting follow up

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I’ve been spotting now for 3 days and freaking out. It’s nothing heavy and only when I use the bathroom. I ended up in the ER. they checked my HCG (28,600) and did an ultrasound. The baby is exactly where it needs to be and had a heart beat. They said I was 6 weeks. (I thought I was 7w4d) I went to my OB and they did another ultrasound. They saw the heartbeat and were actually able to get the rate of 105-107bpm. They said I was only 5w5d. Officially due April 2nd. (meaning I found out super early. Like maybe when I was 2-3 weeks) My cervix is closed and everything looks great. They didn’t see any cause of bleeding on exam or either ultrasound. The only idea was implantion bleeding. If anyone else had this spotting how long did it last for? The ER AND my OB essentially put me on bedrest until it stops and I’m going insane.