Baby still low in pelvic region

Sadee • FTM to Hyde Alan 7.19.17 • Baby #2 due June 21 ♥️
Anyone been told there baby is still low like pubic area? I'm 15 weeks 3 days and yesterday Dr could not find the heartbeat because he thought the baby moved up higher and actually baby was still low. We found the heartbeat strong at 155 just above my hairline but I'm just a little worried why the baby is still low 😕