Vaginal numbing sensation

I'm 20 weeks and 3 days right now and I get this feeling like my vagina is numb...TMI I know but it's weird! I've had it since I was about 6-7 weeks and I've mentioned it to my OB/GYN numerous times. They check and nothing is wrong baby looks healthy and I'm fine. This is my second pregnancy and with my daughter I didn't get this. I'm having a boy now...don't know if this pregnancy is just different all together bc it's a different gender. Has anyone else experienced this at all?