Ladies, 2nd trimester concern!!

Erica • Boy mom.
I'm wondering if anyone else is sort of not "feeling" pregnant anymore. I'm 18 weeks and 3 days and suddenly my boobs aren't tender at all and honestly I just have this general feeling of concern that's come over me. I've read that many women say the 2nd trimester is when they felt the best but since my oldest is 14 (tomorrow coincidentally) in many ways I'm like a brand new mom again and I really just don't remember my first pregnancy well. The more I try to ignore it and tell myself my feelings are unwarranted the more I worry.  I just want to hear the baby's heartbeat and I'll be content but my anatomy scan isn't until February 8th and Id feel foolish with no legitimate concerning symptoms to call my OBGYN based on a gut feeling.  I'd appreciate knowing if anyone else is experiencing this, thanks in advance.