Pregnancy usually means your breasts will grow and change shape. It may be a little, it may be a lot, but either way you will become heavier as the tissue stretches to accommodate the new you.
A really great everyday t-shirt bra, the Croissant Nursing Bra has lightly contoured spacer moulding through the cups which provides comfort and can help with nipple-show.
The design of nursing bras for D cup & up women has come along in leaps and bounds in recent years. The current trend for nursing bras to be as similar as possible to an everyday bra, while adding features like plastic flexiwires to make them safe for pregnant and nursing women.