Still not feeling baby move

Rachel

I'm 17 weeks with number 3 and I've tried everything...cold drinks, sweets....nothing works...Ive tried my doppler and I can't find her heartbeat either...I found it few days ago and she sounded great...with my boys I started feeling then at 16 weeks...I had an early loss in june so I'm very stressed out over my baby girl...anyone else have a hard time using a doppler and getting baby to move