Question...any advice is appreciated

Okay ladies, quick question. I just found out I'm pregnant this morning (yay!), but just barely. Only 1-2 weeks along. I don't have insurance right now (obviously I will get insurance soon), but I don't know how much I'm supposed to be eating. My husband and I are currently on a "diet" eating around 1200 calories a day. I'm guessing that's not enough, but I have no idea what to expect. Any help is greatly appreciated :)