I am 10+3 weeks pregnant LMP. What is risk of miscarriage now with a 160bpm heartbeat heard on doopler?

The heart rate sounds good! But at only 10 weeks, im afraid anything can happen. As you have a history of miscarriage, then it is more likely to happen to you. Although you can still have healthy pregnancies after miscarriages. I'm afraid its just a matter of waiting to find out. Don't do anything too strenuous, just try and relax. Try not to stress out too. Also, just to note it is awfully hard to find a fetal heart at 10 weeks gestation.. so be sure it was the baby's heart rate you heard. Dopplers can sometimes double the rate they track, so it could in fact be your heart rate. Don't use it too often because fetus' at this gestational age move around a hell of a lot and can sometimes lay against your back so you won't be able to pick up a heart rate.. this may scare you but might be nothing to worry about. My advice is to just let nature take its course.. if its meant to be then your pregnancy will continue on. :) All the best! I hope this helped :) x