Worried for my baby

So I had an appointment with my midwife plus an ultrasound I've been so excited for this but my heart nearly stopped when my midwife couldn't find my baby's heart beat again..I'm currently 16weeks and 6 days she didn't stop looking she can't trying to check and when she was getting ready to send me down for an emergency ultrasound she found the heartbeat. I'm already high risk and she said it could have been the position my baby was in but I'm just really scared I can't live through losing another baby again I fo currently have a 2 year old I need to also worry about .

I'm just having a bad day and I'm really scared my baby won't make it

Ultrasound looked good but they kept checking my cervix and now all my appointments are 2 weeks apart ..😔