Growing too soon?

Kimberly
According to to Glow, I'm 4w1d, but I feel like I'm already growing. I had been gaining weight before I found out, so I've chalked it up to that, but my boobs have nearly doubled. I was a 32C (should be a 34B really but wasn't 34 around). Now I have the quad boob as my breasts are so enlarged. Is anyone else experiencing this so early? Am I maybe farther than I thought (I'm highly doubting this)?