I bought two of these bras, one was a 34E and one a 34F.  I was a 34 E while pregnant and I should have just stuck with that one size.  The 34 F really only fit the week my milk came in, then it was too big.  So I suggest you order the size you are at the end of pregnancy.  I loved this bra and wore it every day.  It is full coverage, so no super low neck lines.  It was very supportive but still comfortable.  The clips were heavy duty and no fear of having them pop open on you if you move wrong.  I loved this bra and the support it offered, I didn't look or feel like a nursing mom in it!