21weeks and experienced lower abdominal pain

Today I am 21weeks and while working I experienced very sharp pain in lower abdomen, feels like period days but more intense. That very sharp pain lasted for less than 10mins and with from time to time also felt movement of my baby in the same area. Does anyone experienced this? Is it normal? The pain started in afternoon and lasted for hours (atleast the one I can tolerate) and it has combi of pain at my lower back as well. Hope to hear from other moms. #FirstimePreggy