Boob question

Heather
AF is due in 3 days, and each month my itty bitty's get a little sore, that's about it. We started TTC a couple months ago, and earlier this month we tried pre-seed for the first time. My boobs have doubled in size within the past week. I was a tiny A cup a couple weeks ago, and now I'm spilling out of a B. WHAT IS GOING ON?! 😅 Wondering if this has happened to any other small chested ladies. I know a full B is still small, but I feel like I could knock someone out with these new girls! 😂😂😂