I legit just had this last weekend! I would describe mine as chest pain (both inside and out) but it started off how you describe… I went to the ER (mine got worse) and they ruled out stroke/heart attack. I believe it’s actually something called “costo” which is an inflammation of the rib cage! There are exercises for it!
@Devon i hope its normal
Might be where baby is growing and skin is stretching. Might also be baby is sat on a nerve . Get checked over if your not sure :)