Bras?

Midge • I`m 34, married for 11 years and will be trying for number two soon. I had some ovulation issues when trying for my son so I’m hoping this go around is easier!
So my breasts are definitely bigger already. How at only 4 weeks is beyond me but I am thinking about buying some new bras. I've heard sometimes people buy nursing bras to wear during pregnancy. Too soon or should I just buy some bigger bras?