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Pregnancy Week 1

Parents logo Parents 5/18/2022

how big is baby?

Your due date will be calculated from the first day of your last menstrual period. Conception occurs about two weeks from this day, and that's when you're truly considered pregnant. In just 40 short weeks, your baby will grow from the size of a tiny seed to the size of a plump watermelon.Baby's Length: 0.00in.Baby's Weight: 0.00oz.

baby's development

Baby? What baby? This concept may be a little hard to wrap your head around, but even though you're technically in the first week of pregnancy, you're not quite expecting -- yet. Here's the deal: Because it's generally impossible to know the exact moment of conception, most healthcare providers count 40 weeks from the first day of your last menstrual period (LMP) to calculate your due date. According to this method, they date the beginning of "pregnancy" from about two weeks before the sperm penetrates the egg -- which is where you are right now. Already spotted that pink line on a home pregnancy test? You're further along than you think, so skip ahead to Week 4.

week 1 ultrasound


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There's no ultrasound image of your baby-to-be for weeks 1 and 2. While your health care provider counts these two weeks toward your due date, you aren't really pregnant. Confused? Your pregnancy due date is calculated using the first day of your last menstrual period (LMP). Obviously you weren't pregnant at that time, but it's the best reference your health care provider has for estimating baby's arrival day (until you get an ultrasound, which may provide a more accurate due date).

this week's to-do list

Start taking a prenatal vitamin if you haven't already.
Write down the date of your last period or two.
With your partner, create a family health history, including any genetic or chromosomal disorders.
Quit smoking, and cut out any other bad health habits.

this week's faqs

How early can I take a home pregnancy test?

How soon can I detect if I'm pregnant?

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