I got my fetal doppler at 8 weeks and have heard the heartbeat on my left side every time. I am now…

I got my fetal doppler at 8 weeks and have heard the heartbeat on my left side every time. I am now 9 weeks 4 days and the baby seems to have moved in the middle... is that normal? I didn't notice this with my first pregnancy ( but then again, I didn't get a doppler till the end of 10 weeks with that one and every pregnancy is different. ) but I am just curious because for a good week or so it has been on my left and no where else.