I have a Doppler too and it's always on the right side. On average I get a 160 and I'm having a boy so I don't believe in this theory
I dont believe in it either its just my mom who does iv told her many times it'll just be luck if she's right lol im only 15+2
My doctor always found his on the left side but now It's more towards the middle. And no I don't believe that since his HB started at 160 and now It's at 130-140. I'm 29+5