I started at 20 weeks each time and I am a 10G. I found it hard to get used to the first time, now I struggle to go back to bras with underwires .

If you are really uncomfortable you can still wear underwires but you need to make sure that they are not even a bit too small and dig in anywhere as that can damage your milk ducts. That is what I have been told anyway. Maternity bras are designed to grow with you so even though your breasts will get bigger during your pg you don't need to buy new bras every month or 2. You could also find just wirefree bras for while you are pregnant as you don't actually need the clip up straps yet. Some of those feel much more supportive (though usually not very attractive ).