slowed movement ?

Sheytanna
I started feeling my baby at 18 weeks and during that 18th week it seemed to get stronger and more frequent and now I'm 20 weeks and in the 19th week I feel like baby's movements slowed down a lot.. I still feel a few times a day but I was wondering if anyone else had gone through this or if I should get checked at maternity? I have an ultrasound Friday no matter what for my anatomy scan but I can't help but feel anxious