Getting pregnant

Okay so I just got some prenatal vitamins from my doctor so we could start (well continue with better luck) to conceive. But I am absolutely terrified of getting pregnant because how am I ever gonna fully be prepared and ready? What if something happens? What if we don't have enough money? What if my man changes his mind once I get pregnant? I'm already over weight and now I'll get fatter? Oh my gosh I'm just terrified deep down. Any help?