boobs decreasing.

Hi, I'm currently 13 weeks, and for the last two days my boobs seem to have been decreasing in size. They've been big and swollen since about week 5 and I've gone up a cup size. But the last 2 days they've lost their heaviness and and now only a bit bigger than what they were before I became pregnant. I've had bad headaches the past 2 days, and am still very tired and feeling sick on and off. Should I be concerned or is this just part of symptom reductions that come with moving in to 2nd trimester?

Its probably just coz your into the second tri now :) I was waiting & waiting for my boobs to change this time around, as they have every other time & they did nothing til the last few weeks! They feel a bit fuller, but thats about it!