I am 39 weeks pregnant and had a rib pop out of place two weeks ago where the cartilage meets my breastbone (under my left breast). Since then I've been feeling the numbness, and my best guess is that it has to do with my ribs recovering from being pushed out. I'll be checking with my doctor today, but I'm not too concerned. My little girl is still moving around strong and the numbness is above my uterus so I can't see it affecting her.
I am 24 weeks along with twins and started the same feeling about 2 weeks ago. I had my monthly OB appointment and told the doctor about what I was feeling. my DR told me its probably a pinched nerve so she send me to physical therapy. So far I've had physical therapy twice and the feeling on my right back is feeling much better so maybe physical therapy will work your you. After the first session I wasn't to convince it will work since felt worst and bruced after but after my second session I feel much better. Now the only thing that has me worried is the the numbness/burning feeling under my right breast has increase slightly it feels like something is ripped inside I hope after a few more sessions with the therapist it goes away.