Also if u have an anterior placenta it cushions baby movement and makes it harder for u to feel I had one with my last baby and sometimes I would go days when I was 31 weeks with out feeling her and when I would go to er everything was fine and u could hear here moving on the monitor
It's hard but don't start stressing just yet. I didn't feel anything until the end of my 18th week. Even then i had to be laying down and really concentrate to be sure if I was really feeling my little hamster. I've read sometimes ftm don't feel anything until after 20 weeks.
My midwife said its normal to not feel consistent moving until 24 ish weeks. Baby is still small. My first baby i didn't feel at all until 22 weeks and she was just fine. This time I'm 33 weeks with a healthy baby and i would go several days without feeling much of anything before i was 24-26 weeks. It got more consistent after that. I know a lot of people get a fetal doppler for at home and some piece of mine. Good luck! I bet baby just changed positions and now you can't feel much.
Don't worry, most ftm's don't feel baby move until about 20 weeks. I was 19 weeks the first time I felt my baby girl move but didn't start feeling her move a lot until about 21/22 weeks
its very normal not to have felt any movement at 18 weeks