I'll be 13w with my little rainbow baby tomorrow at my last appointment (11w) doctor said everything was going good and heart beat was 166 I got a Doppler to use at home since my husband wasn't able to go to the doctor with me and I can hear the heartbeat fine but the heart rate only reads in the high 60s could this be because my uterus tilts really far back or from something else it's starting to worry me has anyone else had this happen?