I agree with YW but also with Waiting . The first six weeks are a big cloud and after that it is as if the clouds clear and I felt much more back to myself and confident. You change irrevocably because it is impossible not to but for the better. I am a more confident person, I can multi task amazingly and can function on all cylinders on very little sleep after four cups of coffee I am not sure I can do any of those right things now.
But also as soon as the baby is born you get something back. You may be crazy with lack of sleep and worrying that s/he is breathing every five minutes but just being able to choose some normal clothes is nice. For some strange reason having nice new normal PJ's was heaven. Eating what you want, a sneaky glass of wine and not feeling like a ten ton truck are things that I can't wait for.
You get a little bit of yourself back pretty soon and after six weeks you find your groove. Second babies are even better despite juggling the two. Bit nervous about three..