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Pregnancy is a physiologic transition that brings a lot of emotions and different feelings in the expecting mommies. However, the emotions of anxiety and stress usually overshadow the feelings of happiness and excitement in women who are becoming pregnant for the first time and that’s why we have devised this week to week guide for you so that you can know with precision what’s happening inside your body, what symptoms will you experience during the first week of pregnancy, how is your baby developing and what cautions you must take for a safer pregnancy.


Most females don’t even realize that they may become pregnant during this week or by next cycle. Moreover, little is known about the actual time of conception and for this reason, healthcare providers typically count the conception from your last cycle. It may sound surprising but in clinical terms, your pregnancy is evaluated before the conception even occurs. So according to this calculation, during the first 2 weeks of pregnancy, the egg may not be fertilized yet.

The development of baby hasn’t yet begun. During first week, maternal hormonal level rises and helps in maturation of a bunch of eggs (also known as follicles). During this maturation process, one egg grow slightly more than other eggs and is known as graafian follicle. This later ovulates and fuses with sperm to form the zygote.

However, if we calculate the pregnancy starting from the actual day of conception, not from your last cycle (as doctors do), during the first week (which corresponds roughly to week four of pregnancy), no noticeable physical symptoms will take place. However, you will experience some internal changes such as digestive problems like constipation, gas and nausea. Other signs include fatigue, tender breasts, mood swings and morning sickness. Again, some may feel the symptoms and body changes, others will not.


It is always recommended to book your appointment with your healthcare professional to get a preliminary evaluation of your physical health (in terms of your weight, medical conditions) before getting pregnant. Healthcare providers also suggest booking a pre conception appointment with a gynecologist or obstetrician to discuss in detail about any personal or family history that may influence pregnancy or health of your baby. Likewise speak to your doctor regarding incorporating healthy habits and lifestyle changes that may help in optimizing your health and well being of your child. Most importantly, you should start taking 400 microgram or 0.4 mg of folic acid even before you conceive. Folic acid supplementation helps in minimizing the risk of neural tube defects.


During the first week of pregnancy there’s no major development of the baby, other than the egg leaving the ovary and traveling to the fallopian tubes. You’re not actually pregnant at this time, since conception itself doesn’t happen until about two weeks after your period ends.

Still, this week is included in the pregnancy calendar to help the doctor calculate the first day of your last monthly menstrual cycle. It’s from this day that the nine-month cycle (or 40 weeks in medical terms) is calculated, and your EDD (expected due date) is determined.

Once the egg is fertilized, the cells begin to divide over the next seven to ten days. During the first week the “baby” is called a blastocyte. You can break the blastocyte into two parts — the external part of this blastocyte will become the placenta, and the internal part will be the embryo during the second week of pregnancy.

If more than one egg gets released and fertilized, multiple zygotes may form. The zygotes have 46 chromosomes, an equal number from each parent, and the chromosomes have genetic material in them that determine the baby’s sex, hair color, features, skin color, height, and eye color.


t is possible that some women can present pregnancy symptoms within a week of conception, according to the American Pregnancy Association. However, other women often do not have symptoms this early. Pregnancy signs can occur usually a few weeks after conception.

A couple of days after conception, some other pregnancy symptoms that can occur in some women are cramping and implantation bleeding. This may happen between 6 to 12 days after egg fertilization and the egg’s attachment to the uterine wall, states WebMD.

For most women, some signs that they may be pregnant are a missed period and a vaginal discharge that is whitish in color. Some other early symptoms may include experiencing breast tenderness and fatigue. However, the way to be sure if a woman is pregnant is to perform a pregnancy test.