Sharp pain on the left

Currently 39wks 4 days. I’ve been getting sharp pains on my left breast/ribcage whenever I’m lying on my left side, but i don’t get any lying on my right. Is it because my left breast is still developing or the baby’s foot is there? I hope the baby is doing fine since im lying on my right side most of the time now. #firsttimemom #paranoidmom