Why does my left breast gets bigger during my period. I also noticed like lumps on my nipples.

Glands. The breast contain glands that swell depending on the time of the cycle. Sometimes those glands can vary in each breast, so each breast may vary.

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Late period, neg hpt left breast is lumpy but 1 lump is very obvious and nipple is swollen too. Grandmas had bc. I'm so worried, breast is swollen too.

Get it seen. A dominant lump requires a physician office visit. If it's new, and you discovered it yourself, the chance of it killing you is very low. I am VERY glad that you are keeping vigilance over your health and I trust you'll get seen promptly. Read more...