Ok am i going bonkers or not??

I keep getting this strange pulsating pain, down stairs. It feels like my cervix itself is pulsating. Its only slighty painful and is coming and going. Its been going on for maybe one week now. In a way it kinda feels like girly bits are opening and closing, if you get what i mean.

Its definatley not bubs hicupping, thats another feeling, and i have been having the ligament growing pains, so know what they are as well. But this is weird.

Any help or advise would be muchly appreciated!!!!