Burning side of the breast…

Carolina

I’m 27 weeks pregnant and lately I’ve been having some pain when I lay on my left side or when I lay on the right side and my left arm squeezes my left boob i get the same pain, best I can describe is like a burning pain, I googled and of course it says breast cancer 😖😖… but I don’t have any lump or anything like that and it doesn’t burn when I’m standing up or sitting, it’s only when I put some type of pressure/squeeze… is this normal?? Could it be the milk coming in??? Why only one breast tho…

TIA!