16 weeks & paranoid

I’m 16 weeks pregnant, all my ultrasounds I’ve done my due dates stayed the same. Saw a healthy heart beat, heard the heart beat, did a Nuchal translucency test and I’m a low risk for Down syndrome, used a fetal Doppler on the 16th of this month and heard my baby’s heartbeat once again. Everything’s measuring up to how it needs to be, but I don’t know why I have a bad feeling my baby isn’t alive for the past couple of days... I feel fine, I’m not as tired as before. I’m eating normally. I sometimes feel my uterus get hard. My boobs don’t hurt. No morning sickness for a while now. My next appointment is on the 15th of Dec. I’m so anxious and nervous. I’ve had a miscarriage before at 7 weeks last year, I’m terrified my baby isn’t alive anymore. I’m not bleeding, I’m not cramping.. I don’t know I’m scared it may be a silent one