16 weeks pregnant

I am 16 weeks pregnant today. Recently I’ve been really nervous and I don’t know why. I’m always afraid that something is wrong with my baby and I don’t feel pregnant anymore. Which I obviously know I still am I just don’t feel like I am anymore lol. I still have morning sickness every single day. But all the other symptoms have gone away. I did end up getting a at home fetal heart Doppler that way I can check on back whenever I want Too. At my last doctors appointment my doctor was able to find the heartbeat right away. Now I know that they will find it almost instantly only because they know what they’re doing. But when I try I find nothing. It’s really making me nervous. Has anyone else had this problem? I never felt like this with my daughter and whenever I checked her best eat I could find it almost immediately. I have an appointment on Friday too hopefully find out the gender. Just really hoping everything is okay and that baby is just in a position or still too small too find the heartbeat myself. 😔