Still haven’t checked in with the doc about your estimated due date? Not exactly. Throughout the third trimester, your baby will gain weight quickly, adding body fat that will help after birth. If you’re in week 16, you’re actually 15 weeks and some days pregnant. Why start the clock on pregnancy before sperm even meets egg (and, actually, before your ovary even dropped the fated egg that made your baby)? By this time, any morning sickness is probably gone and the discomfort of early pregnancy has faded. You can purchase low cost, high quality pregnancy tests here. It’s calculated counting from the first day of your last menstrual period (LMP) instead of the day you conceived. The measurement of the baby during this stage is approximately 1/8-inch and weight is 0.03 ounces. Babies born on or before 36 weeks 6 days are consider preterm or premature. Out of this group of eggs, one will become mature and continue on through the cycle. All the organs and limbs (extremities) are present and will continue to develop in order to become functional. At nine months pregnant, you're so close to the end of your third trimester and your pregnancy! Most internal systems are well developed, but the lungs may still be immature. If there are two Xs, it’s a girl. By the end of the third month, your baby is fully formed. If you could look inside the uterus at your baby right now, you would see that your baby's skin is reddish in color, wrinkled and veins are visible through the baby's translucent skin. Your Guide to the First Trimester of Pregnancy, Your Guide to the Second Trimester of Pregnancy, Your Guide to the Third Trimester of Pregnancy. This means that medications will be used to make you go into labor and have the baby. At this stage, your baby is starting to explore a bit by doing things like opening and closing its fists and mouth. In both cases, your due date is the same — it’s the language referring to it that’s different. This secretes (releases) the hormones progesterone and estrogen. The progesterone helps prepare the endometrium (lining of the uterus). If you're carrying twins, a full-term pregnancy is considered at least 38 weeks. You may be tempted to start the countdown till your due date and hope that it would come early, but each week of this final stage of development helps your baby prepare for childbirth. And that's why some months in the chart are four weeks long and some are five weeks long. This is normal and isn’t something you should worry about. Most healthcare providers will have you wait to come in for an appointment until you have had a positive home pregnancy test. After the 8th week, your baby is called a fetus instead of an embryo. Get useful, helpful and relevant health + wellness information. On average, a month is 4.3 weeks, so that means the number of weeks and months of pregnancy don't match up exactly. Fifteen full weeks have gone by, but not 16 weeks, so people say that you're both 15 weeks pregnant and in week 16 of pregnancy. Health care providers refer to three segments of pregnancy, called trimesters. This time period is about nine months long. By the end of the fifth month, your baby is about 10 inches long and weighs from 1/2 to 1 pound. By this time, the baby’s first nerve cells have formed. Your baby's reflexes are coordinated so he or she can blink, close the eyes, turn the head, grasp firmly, and respond to sounds, light, and touch. During this stage, your baby will continue to grow and mature. These tests are very accurate once you have enough hCG circulating throughout your body. Why is pregnancy calculated from your last period? Human gestation is the growth and development of a human baby in the uterus. 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