This is my first, so I don't have a lot of experience. But I know I bled pretty heavy, bright red blood on and off for two weeks right about that stage of pregnancy. I was terrified that I was miscarrying, but everything ended up absolutely fine. I'm 30 weeks now and he's bouncing around like crazy and healthy as can be.
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I would ask your doctor, but if they just did an ultrasound and there wasn't anything wrong, they probably won't be able to tell you anything more. I know there's usually nothing they can do, even when there's something wrong, before you get to about 20 weeks. I think you should really just do your best to stay positive. Think about that strong heartbeat and how fast your little one is growing in there, and look forward to the next time you get to see him on the U/S!