Question doppler 18 weeks

👣👣💙💙michelle💙💙👣👣

Hi, so I use a home doppler once in a while to listen to babies heartbeat when ever I listen to her heartbeat I find it in the same exact spot always and its really low right above my pelvis the doppler is almost on my pubic bone..her heart beat as become easier to hear so I'm not mistaking it for a different sound . My question is, is it normal her to be so low and find the hb in the same spot every time? Where do you ladies find your babies hb?