tingling, pulsating vibration down there

So I'm just shy of 13weeks pregnant, yesterday out of the blue I started experiencing what all I can describe as a tingling pulsating buzzing vibrations in my vagina, they come and go but when they are there I really can't miss them. It doesn't hurt just feels very strange and really don't know what it's is. Hoping it's normal anyone else or is it just me?? Xx