Having a baby while in Graduate School?!

Is anyone here planning to have a baby while in graduate school? I'm getting a Master's in International studies; it's a two year degree, and I'm only a quarter of the way through. Should I continue, or am I crazy to try to do both? (It's day 40 of my cycle and I just had a positive pregnancy test.) I remember last semester was really rough on my body-- lots of late nights, and I was sick a lot. My husband is in graduate school, too, so he won't be able to help me a whole lot. Any advice? Opinions?!?! Anyone done this before???