Congrats!
With my first I bought a huge box of clothes for $100 from a coworker. She had work/dress clothes, leisure clothes, swimsuit, ect. They were all Motherhood and very nice (but I learned not to put them in the dryer...)
I gained a lot of weight while on bedrest in the hospital so they didn't fit me with the second pregnancy. That time I bought some very nice stuff at Burlington Coat Factory, which has a big selection. I wouldn't say they are QUALITY as in they might not hold up after four pregnancies, but since I wasn't planning to have anymore babies they were WONDERFUL for the money. I also bought a few things at Ross that were lovely and well made but not a big selection there and a little more then I wanted to spend.
I found when I finally broke down and went to Motherhood the third pregnancy that they are actually super cheap! Even when I'm not pregnant I'll buy clearanced clothing from them. They were cheaper then Target's regular prices with a bigger selection.
I do love my Target brand black knit pants though.