Heartbeat

Okay ladies I am a FTM and I am having a lot of anxiety! Yesterday I went to my OB appointment and my BP was 142/80 so they told me all this scary ass shit and got my anxiety up and my blood pressure up to 154/94.. I was told to go home and lay down and take my blood pressure every hour and I did and it’s been 112/64 or around that area.. I am also diabetic so my sugars were excellent yesterday as well.. well I have a home Doppler and being paranoid cuz i lost my daughter at 19 weeks I checked his heartbeat and it was in the 130s and then I checked it again it was in the upper 140s. Now my son has always been in the upper 140s to low 150s my whole pregnancy, now my question is this, the closer I get to giving birth does their heart rate normally drop like that?! I am just really paranoid now and I just want my son to be okay.. please no bashing or anything I know y’all aren’t doctors or anything but they didn’t tell me shit yesterday! Only bad news