This Is My Fifth Pregnancy And I Am 18 Weeks

This is my fifth pregnancy and I am 18 weeks pregnant, I have felt movement at about 15 weeks. I have not felt any movement for 3-4 days, I know it is early but I am worried. With all of my other pregnancy I felt movement early on and never had it stop. I have been drinking cold water and laying on my left side to no avail, I had pain in my abdomen earlier in the week, but I just thought it was my uterus stretching. I haven't had any bleeding,but any information you can provide is much appreciated.