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Pregnancy Calendar

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illustration of woman touching sore breasts because she is pregnant

Week 4

Your baby is:

  • Implanted snugly in the rich lining of your delicious uterus.
  • Still less than a millimeter long.
  • Seriously, a MILLIMETER. Go pull out a ruler and wrap your mind around that.
  • I will wait.
  • Okay, that little millimeter is growing three different cell layers already — the ectoderm, endoderm and mesoderm.
  • In case you FOR SOME REASON don’t remember high school biology class (shame!), those are the earliest beginning of your baby’s nervous system, hair, skin, gastrointestinal tract, pancreas, liver, thyroid, skeleton, blood system, connective tissue, urogenital system and muscles. Oh, IS THAT ALL?

You are:

  • Probably wondering where your period is.
  • Beating the hell out of your boobs to see if they’re sore.
  • Peeing on sticks, possibly cursing out sticks.

Sometime around the end of week four, you will officially miss your period, if you’re the sort of gal who pays attention to that sort of thing. (I know before I ever entering the trying-to-conceive game I was definitely the type who could not remember my LMP for the life of me.) And if you’re the sort of gal who enjoys peeing on your dollars, you will probably run right out and buy some of those “test FIVE DAYS before you miss your period!” pregnancy tests.

Ignore what the tests say on the box: very very very very few women will get a positive result a day before they miss a period, let alone FIVE DAYS before they miss it. I’m sure it happens, although I must admit that it has never happened to a single pregnant woman I’ve known. And I’ve known a lot of pregnant women. We all reported clear-cut positive results about a day to five days after we missed our periods, but a lot of negatives before.

For my current pregnancy I tested on day 28 in the midst of terrible, terrible nausea but got a negative. (My cycle is about 30 days, usually.) This negative convinced me that I had the stomach flu instead of the knocked-up flu, and only after six more days of heartburn and nausea did I finally break down and buy more sticks. And boom! A resounding positive result in about five seconds.

The point is: if you MUST test early, re-test once you really and truly have missed your period.

Now. Onto the most popular topic ever…

The earliest signs of pregnancy.

For a lot of women, sore boobs are the first sign that Something Is Up. But sore boobs are also a pretty common symptom of regular ol’ PMS. So…argh! Useless! A lot of women (myself included) report that pregnant sore boobs ARE different than PMS sore boobs, but in a way that’s hard to describe. Mine are more…burny and stabby and heavy, whereas PMS boobs just kind of…ache. Wearing a bra hurts, going without a bra hurts. Wrapping a towel around your chest after a shower hurts. That moment when you take your bra off at the end of the day hurrrrrrrts, like YOW YOW YOW THAT HURTS. Except when it doesn’t hurt, because the soreness can and does vary from day to day. (So if you’re pregnant and your boobs hurt yesterday but don’t hurt today, don’t panic, and don’t mash them into lumpy potatoes while trying to get reassurance that you’re still pregnant.)

Personally, I like to shake things up a little bit and get the morning sickness going as soon as humanly possible. The books say most women get nauseous around week six or seven. (Those women who aren’t among the lucky 25% who never suffer from it at all.) (I HATE YOU.) My gastrointestinal tract is the first thing to go all kablooey in pregnancy, with dry heaving, sensitivity to odors, acid reflux, constipation and bloating to the point of needing maternity clothes showing up right away. (I am wicked sexy.) I’ve managed to steer clear of actual puking so far, but we’ll see what happens around week seven, when my general digestive discomfort turned into full-on vomitous misery in Pregnancy #1. (I really do think I had a 24-hour stomach bug the week before I tested, but the pregnancy hormones kept everything churning for a few extra days.)

All my research sources mention “implantation bleeding” as an early sign of pregnancy. This would happen sometime between the end of week three and the beginning of week four and result in a light and one-time spotting on your underwear. Nobody I know has ever reported this actually happening to them, but dozens of women I know have tried to convince themselves that no, that’s NOT their period starting, that’s implantation bleeding, I better pee on a stick! (Full disclosure: I may be including my own dumb hopeful self here.)

And then there’s the fatigue, the headaches and backaches and uterine cramping and changes in appetite and the frequent dashes to the bathroom to pee.  All this and those pesky peesticks may STILL be giving you the Big Fat Negative.

Related post: Pregnancy and COVID-19: What We Know (& a Few Things We Don’t)

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About the Author

Amy Corbett Storch


Amalah is a pseudonym of Amy Corbett Storch. She is the author of the Advice Smackdown and Bounce Back. You can follow Amy’s daily mothering ...

Amalah is a pseudonym of Amy Corbett Storch. She is the author of the Advice Smackdown and Bounce Back. You can follow Amy’s daily mothering adventures at Amalah. Also, it’s pronounced AIM-ah-lah.

If there is a question you would like answered on the Advice Smackdown, please submit it to [email protected].

Amy also documented her second pregnancy (with Ezra) in our wildly popular Weekly Pregnancy Calendar, Zero to Forty.

Amy is mother to rising first-grader Noah, preschooler Ezra, and toddler Ike.

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About the Author

Our Pregnancy Calendar, Zero to Forty, was written by Amy Corbett Storch while she was pregnant with her second son, Ezra.

Amy, also known as Amalah, writes the Advice Smackdown and Bounce Back here at Alpha Mom. You can follow her daily mothering adventures at her own site, Amalah.

About the Illustrations

The Zero to Forty illustrations were created by the artist Brenda Ponnay, aka Secret Agent Josephine. Brenda is very talented and these images are copyright-protected. You should hire her if you want your own unique ones.