Reduced movement..

Two nights ago I was in a car accident, it was not severe by any means just a fender bender but the “force” of the hit did cause me to jerk ahead in my seat & caused the seatbelt to lock up around me. I’m 28 weeks pregnant. My sister is a CNA & a mother of 4. She had me do a kick count & kept track of the cramps I was having. She deamed that everything was okay. I stayed the night at her house & the cramps went away & my daughter was kicking away. Yesterday she kicked a few times but not as many as she normally does in a day. Today it’s the same thing, she’s kicking but not as much as she usually did before the accident. Should I be concerned?