This pain under my chest?

Tonight after dinner i felt this pain when i took my bra off. Only when i breath in and out, laying sideways and if i touch it. I feel this sharp pain. Now this is only my left side not my right. However I should be getting my period soon my boobs feel enourmesly bigger that's normal. The bra felt fine before when i wore it i've had it for a month or two. So any ideas?
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+1 y
I'm giving it like till tonight if i can really handle going to bed. I just don't know if it is the OBGYN or my regular doctor to see?
Updates
+1 y
Well I'm getting ready for bed. Lets see how tomorrow turns out!
This pain under my chest?
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