nervous nelly

I'm 15+5 but I feel like my belly has stopped growing & im just continuously worrying. My last ultrasound was at 8+1 & I will not be having another one until 19weeks for my anatomy scan. I have my genetic testing being done next Monday & im wondering if I ask them to hear the heart beat again will they do it for me just to ease my nerves & make sure my little chocolate chip is okay. (I've had a previous lost).