breastman,
I think the tightness /swelling is pretty common fairly early on, and it also reoccurs from time to time going forward.
As far as I know, the early manifestations are due to fat starting to relocate to the breast area and is not true breast tissue growth, although since boobs are largely fat anyway, it is an indication that the process has begun
You'll probably find that your awareness of it will decrease as you get used to it, but eventually ( might be a few months but it varies) you'll find small tender/painful lumps behind and possibly to one side of the nipples...that's budding...that's when it starts to become really real!