This is my second pregnancy. Not sure if that makes any difference, but I'm seven weeks and four days today and my breasts have already grown a full cup size. I've never had a large chest and it feels like they exploded and honestly I might have to buy another bra soon. Is this normal? Have any of you experienced growth this fast? I'm as big now as I was in my third trimester with my first son. Just trying to gain some perspective as someone freaked me out that I might be having twins.