Concerned

I’m a FTM and I’m always worried about my baby. I’m 16w4d and I just don’t feel pregnant anymore ... I don’t really feel like my belly is growing all that much and I still haven’t felt movement.. last time I saw baby was at 13w and baby was healthy and moving around... but I have no more symptoms and I’m scared that maybe my baby didn’t make it? I know I’m probably overthinking this... but I can’t help but feel somethings wrong all the time because it’s my first time being pregnant.... I don’t have a Doppler so I can’t check for a heartbeat whenever I want and that scares me even more