Numbness in front lower rib

Kelsie
I'm a first time mom and almost 30 weeks pregnant.
Does anyone else feel random numbness in their ribs in the front? I've been feeling it off and on for some time now. Got new bras because I thought it may have been the underwire. It started after my last dr appointment and my next one is on Wednesday. Just curious if anyone else has felt this way at all? 
I can push downward on the spot and that helps but my arm gets tired :/