Breast development

So I have seen some girls make posts about chest getting sore, veins being more prominent as early signs of breast growth. So I am 5 months in. I've always been overweight so had some flab in the chest to begin with but lately nipples especially have been itchy, not sore, just itchy and it does seem like the flab is getting bigger. Is this normal/a sign of breast growth? Of is it too early yet and I'm imagining it?

Thanks!