Is it? Could it be? Yep. At the very end of this week, which also bizarrely marks the end of your first month of pregnancy, you'll miss your period. And the ride of your life will begin.
Your Body
This week your baby continues to implant in your uterus, burying itself deep within the endometrium. Once implanted, your baby starts to produce a hormone called human chorionic gonadotropin (hCG), which helps to maintain the lining of the uterus. It also sends a signal to the ovary to stop releasing an egg each month, which stops your monthly periods. Some women experience slight cramping and spotting of blood during this week while implantation is taking place, and they may mistake this for a period, as it often occurs around the time their monthly period was due.
hCG is the hormone that is measured in pregnancy tests. This week a pregnancy test will probably be able to detect your pregnancy! hCG also causes the symptoms of pregnancy, which can appear this week. Fatigue, tingling or aching breasts, or nausea might lead you to believe your period will be starting any day because the first pregnancy symptoms resemble premenstrual syndrome (PMS). But by the end of this week, your expected period will not take place. Your pregnancy is well on its way!
Once Mini Me or He implants in your uterus and that placenta starts to grow, your heart starts beating more quickly. You might be putting in an extra 15 beats per minute (even when Taye Diggs isn't onscreen). Until your blood volume catches up to all that extra pumping (which it won't do for a number of weeks), you're likely to feel tired most of the time. Sounds like a good reason to schedule a siesta!
A lot of that extra blood is heading straight for your breasts, resulting in tenderness and the tendency for your nipples to show ... through your down jacket. (Another early pregnancy sign: Your cervix is softening and changing color. But if this is something you're able to notice on your own, we don't want to know about it.)
Your Baby
Four weeks into your pregnancy, your baby (called an embryo) consists of two layers of cells — the epiblast and the hypoblast — that will eventually develop into all of your baby's organs and body parts. Two other structures that develop at this time are the amnion and the yolk sac. The amnion, filled with amniotic fluid, will surround and protect the growing embryo. The yolk sac will produce blood and help to nourish the embryo until the placenta takes over that role.
Your microscopic embryo is already hard at work this week creating the placenta, umbilical cord and the basics of his or her body.
The embryo is now made of three layers that will transform into the different parts of your baby's body. The endoderm, or inner layer, will become your baby's intestines, liver and lungs. The middle layer, or mesoderm, will become your baby's heart, sex organs, muscles, bones, and kidneys, and the ectoderm, or outermost layer, will develop into your baby's hair, skin, eyes, and nervous system. Believe it or not, your baby is already starting to look like a tiny little being (not necessarily a human being) complete with a head, a mouth opening and a primitive brain and heart.
By the end of this week, your baby measures about 1/25 inch long, about the size of a period (like the one at the end of this sentence, not the one you just missed).
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