I felt that way too for my first pregnancy. I didn't feel like the baby would be alright until i could hear his heartbeat. I would definitely recommend getting a doppler so you can hear the heartbeat and be able to relax.
I was super paranoid! But then I got tired of it and bought an at home doppler and my fears went away. I listened to baby whenever I was nervous and got rid of those nasty fears.
I was paranoid with my first baby. I'm 19 now and on baby number 2. On Wednesday next week I'll be 16 weeks and I also have a dr appointment Nov 2nd (: I still get paranoid
No I think you should be fine. Maybe it's just that you're paranoid. Is this your first baby?