Any ultrasound techs?

Sarah

I had a positive pregnancy test then 2 weeks later I started bleeding for 2 weeks. I was convinced I had a miscarriage bc I've had three since Nov (I do have a healthy 2yo tho). Last week I talked to my doctors office and they had me come and check my hcg and it was 86,000. Then they had me come in for an ultrasound and baby was there, looking good with a 181 heart rate. I had a tiny subchroionoc hemorrhage (like millimeters small). Then yesterday i had pretty moderate bleeding that is now tapering but I'm preparing myself for another miscarriage. I'm just shocked bc of how strong the heartbeat was. I'm having another ultrasound tomorrow but I guess I'm curious to see if any ultrasound techs have seen that happen. Does having a posterior placenta pose any risks? One of my other miscarriages the baby had a heart rate of 100 which I was told could go either way.