Question to you mommas!

So over the last few days toward the end of my day I have been getting this intense vaginal pressure followed by this weird throbbing pain in my vaginal canal. It will happen for like 5-10 minutes at a time then it will taper off. It happens throughout the night and by early morning it stops. It tends to get worse when I've been on my feet for too long. I'm currently 36 weeks and have been feeling the pressure for almost 2 weeks but the weird throbbing pain has been the last few days. Also the throbbing pain tends to feel mostly on the left side if that makes any sense. I know what lightening crotch is cause I've had that since about weeks, this feels so different. I'm a ftm so any advice is welcome. I will be bringing it up at my appointment this Monday too.