Good evening. I feel movements since 17.4 weeks, second pregnancy. Cur…

Good evening. I feel movements since 17.4 weeks, second pregnancy. Currently 19 weeks. Throughout the day practically constant "pulsation" (I don't know how to explain it) below my belly button more on the left side, not always rhythmic, unclear what triggers it, but this is definitely not movements. What could this be? The interval between "pulses" is about a second. In this context, I can't understand if there are any movements. It's already annoying.