Terrified something is wrong

Hello ladies! I just need to talk about this because is stressing me out so much.I am curenttly 16 weeks with my second rainbow baby and for the last week or so I just dont feel pregnant anymore,my belly does not feel as hard and I dont know how to explain it but it just does not feel like somenthing is in there if you know what i mean, I know your simptoms tend to disappear in the Second Trimester but still ,and I did not feelt he/she move ,with my first I definetly felt him by now, I know every pregnancy is different but after 2 loses that reassurance of the baby moving would be so good.I also have a blood cloting condition for witch I have to get a shot every night in my belly and I have Rh negativ and my mind instatly goes to the worst case senario.

I have a doctors appointment next week and I am terrified that at the ultrasound he tells me that there is no heart beat,I had 2 loses before both in my first Trimester but still I am terrified and it affecting me so much mentaly.

I just wanted to know if some of you experienced somenthing like this and how did or turn out or how did you cope with it?

Thank you❤