Heart doppler

Probably a dumb question. But that’s why I’m asking Idk. Every time I go to the doctor they always find the baby’s heartbeat on the left side near my belly button. Well I used the doppler tonight (I rarely ever use It) but only place I could find It (In the 140’s) Is on the right side near the belly button. Could he have moved over? I’m 26w and 2d Also there’s like a really slow rate In the 80’s Isn’t that mine? Just curious like I said I rarely ever use It.