Not Feeling Very Pregnant

Erika • 💙5.12.15, expecting #2 💚 12.7.18
I'm 17+4 and this week I just don't feel that pregnant. It's so weird. Like, I first felt the baby at 16 weeks, and I felt several flutters throughout week 16, but this week I don't know if I've felt him at all. It's got me almost panicked. I have an elective ultrasound I had scheduled a couple weeks ago for tomorrow, so I should get some peace of mind then, but has anyone else felt like this around 17-18 weeks?