Am I over reacting?

I am a FTM at 20+6 weeks pregnant and all of my symptoms have disappeared. My bump has been pretty minimal and seems to have shrunk a bit and I haven't gained any weight since 17w. At 17 weeks I had a Dr appointment where they heard baby's heart with a dopler and I met other moms expecting around the same time as me. Once I hit 18 weeks, all my symptoms vanished and I haven't felt any signs of quickening. No more latenight heartburn, sore breasts, frequent bathroom breaks, mood swings, or weight gain. Everyone in my group says they have felt baby at this point and still have symptoms. I have my next appointment in 3 days with my mom group, but I can't shake the feeling that something is wrong. Did anyone else experience this? Am I truly overthinking it?