UPDATE : Everything is just going wrong

UPDATE : So I switch my doctor ( yay not really) my first appointment was yesterday an I had a ultrasound just to make sure everything was good because I just previously had a miscarriage (Mother’s Day weekend) Ok so remember I told yal My last doctor listened to the heart beat with the doppler at 8 weeks an I wasn’t to sure but there was a heart beat . Ok so go back to yesterday with my new doc an I get a ultra sound they tell me that the fetus is measuring at 6 weeks with no heart beat . HOW??? I really don’t understand an to be quite honest I’m telling like I should switch my doctor again . My hgc levels are amazing an spot on . An my last doctor says this pregnancy looks amazing now there’s not heartbeat . I have not had any bleeding , mucus nothing . Today marks 10 weeks . ( sorry if this is all over the place )