Week 1: You're actually not pregnant yet—the clock starts ticking from the first day of your last period. So even though pregnancies are said to be 40 weeks long, you only carry your baby for 38 weeks.
What to do now:
• Start taking a daily prenatal vitamin with at least 400 micrograms of folic acid; this B vitamin has been shown to help prevent neural-tube defects, such as spina bifida.
• Quit any unhealthy habits, such as smoking or drinking. There's no time like the present.
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From the stressful (prenatal tests! gaining weight!) to the sheer fun (buying maternity clothes! your baby shower!), growing a baby involves a seemingly endless host of developments to expect, plan and accomplish. Our step-by-step timeline and checklist will help you navigate your pregnancy with as little stress and guesswork as possible. So grab your pencil, put your feet up and simply gestate!