Get Weekly Updates

Subscribe now for natural pregnancy updates based on your due date!

  • 📲 Email or TXT
  • 😍 Customized to you
  • 👍 Totally FREE
Subscribe Today
Pregnancy Week-by-Week

4 Weeks Pregnant

What a big week for baby! But what about that bleeding or discharge? Plus, what prenatal should you be taking?

  • Baby at 4 Weeks Pregnant 🚼

    Exciting things are happening this week, Mama!

    Now that baby has officially arrived inside your uterus and implanted into the uterine lining, she’ll begin transitioning from a blastocyst to an embryo. (Which is a fancy way of saying, your little one is growing up!)

    Meanwhile, the amniotic sac is forming and filling with fluid—the sac will rupture roughly 36 weeks from now (when your water “breaks”), but from now until then, it will serve some important purposes: to cushion baby from bumps, to regulate her temperature, and to encourage her lung formation. Because, yes, she will swallow and “breathe” the amniotic fluid while in utero.

    The “yolk sac” has started coming together now, too. Not entirely unlike the yolk of a chicken egg, the yolk sac will nourish baby until the placenta is fully formed, nearer the start of the 2nd trimester.

    4 weeks pregnant - Mama Natural pregnancy week by week
  • You at 4 Weeks Pregnant 🚺

    Your body has (finally!) started producing hCG, but it’s still a wee bit early to detect baby via a home pregnancy test. About 1/3 of women, however, will experience a bit of bleeding or spotting this week. (During implantation, baby may disrupt a few blood vessels in the endometrium, causing some of your uterine lining to shed.)

    Though implantation bleeding is typically very light—potentially as light as a drop or two—many women may mistake the sight of blood for their regular menstrual period.

    How to tell the difference? Implantation bleeding will start light and remain light, whereas a menstrual flow typically gets heavier over the first day or two of your period. The blood may appear darker and/or more brownish in color during implantation, and light cramping is fairly common, too.

Mama Natural Book

Introducing the world’s first
week-by-week pregnancy guide
from a natural perspective!

  • Week 4 Spotlight
    What are the Best Prenatal Vitamins for You? 💡

    Wondering what the best prenatal vitamins are for your growing baby? Find out in this post which ones are best for you based on your health and lifestyle.

    Good nutrition is important throughout our lives, but it becomes especially essential during pregnancy.

    Baby will take what she needs from you—whether you have enough to spare or not—so you have to be sure you are getting enough nutrients for you and your growing baby.

    Unfortunately, many moms begin pregnancy deficient in one or more vitamins or minerals, so prenatal vitamins become especially important.

    Pregnancy superfoods like avocados, liver, and dates are great for getting many of the nutrients you need, but with our depleted soils and industrialized food system, it’s not always possible to get everything we need from food alone. Which is why pregnancy supplements and prenatal vitamins are so important for a healthy pregnancy.

    But not all prenatal vitamins are created equally. Click here to find the best prenatal for you.

  • Week 4 Hot Topics 🔥

    Check out these hot topics for your 4th week of pregnancy!

  • Week 4 To-Dos ✅

Get natural week by week pregnancy updates by email or text message
Learn how to have an amazing birth with the Mama Natural Birth Course