During pregnancy, you really want a bra that’s stretchy enough to grow with you as your chest expands. You’ll also want something that’s supportive, since it’s likely your breasts will get a bit heavier and need more support. Lastly, you definitely want something that’s comfortable as many women can experience breast tenderness during this stage.
Sturdy wireless bras with stretchy, slightly compressive fabric and support features like wide straps and a bonded cradle are a great option since they’ll be able to accommodate sizing fluctuations. Longline sports bras are another amazing option because you get extra support from the extended band.