Throbbing in my vagina @ 27 weeks?

Maureen • Separated Momma of 3 Boys Roman 2019 & Ross 2021 & Ryan 2023

I'm 27 weeks as of today. I was laying down for bed & just got a random heart beat like throbbing in my vagina.. But the top part of it right below my pelvic bone. Is this normal? Its my first pregnancy & I've been so nervous of potentially going into labor too soon. I also had very bad trapped gas last night in my mid and upper back.