See, I worry about my situation, because I had the protected sex two weeks before my period, and the unprotected sex one week before my period. They say you ovulate two weeks before, but they also say that's the average women, but each women is different. I guess i'm just trying to convince myself that my ex is the dad. Therefore i'm not going to worry about it...He is and that's that. He's ready to be the dad. :)
anyway, webmd.Com is a good website, that's where I got the information about already being two weeks pregnant when you conceive. Hope this helps! :)
table 14.1: on the grow
week developmental highlights
3 on the day of conception, your ovum and your partner's sperm unite to form a barely visible single cell known as a zygote. It takes the zygote the better part of a week to make the journey to your uterus. Because pregnancy is typically dated in relation to the woman's last menstrual period (lmp), you're already two weeks' pregnant by the time you actually conceive.
4 during the fourth week of pregnancy (approximately one week after conception), the tiny cell ball (.004 of an inch) implants itself in the lining of your uterus. It then divides into two parts, which will ultimately become the placenta and the embryo. By the end of this week, amniotic fluid will begin to form.
5 at the start of this week, the embryo is as large as an apple seed, and the beginnings of its major organs are present.
6 the embryo is now approximately 1/4-inch long. Its heartâwhich is no larger than a poppy seedâhas begun to beat, and other major organs such as the kidneys and the liver have begun to develop. The neural tube, which connects the brain and the spinal cord, closes.
7 the embryo is now about 1/2-inch long about the size of a kidney bean. At this stage of development,its head is much larger than the rest of its body. This is because of the rapid brain growth that has been occurring. The embryo has visible nostrils, lips, and tongue, and the buds of its first teeth are present. The heart has four clearly recognizable chambers. The limb buds have grown into arms and legs, but the hands and feet are mere ridges.
8 the fetus is now 11/4 inches longâthe size of a large grape. It has distinct, slightly webbed fingers and toes, and its veins are clearly visible through its parchment-like skin. The teeth, palate, and larynx are beginning to form, and the ears are starting to assume a more human shape.
9 the fetus continues to grow, and its organs, muscles, and nerves start to function. Sometime during week nine, it begins to make its first spontaneous movements. You won't be able to feel these movements yet, of course, because the fetus is so tiny and rarely comes into contact with the uterine wall.
10 the fetus now weighs about 1/3 of an ounce. By the end of week 10, the umbilical cord is fully formed and blood is circulating along its arteries and veins. The chorionic villi are growing and maturing over the area of implantation, and they will eventually become part of the placenta. If the fetus is a boy, this is the week when his scrotum will form.
11 the fetus is now about two inches long and weighs about half an ounce. Its head is approximately half of its length. The ovaries or testicles are fully formed and the external genitalia are developing; but it's still too early to distinguish the sex of the fetus.
12 the fetus is now about 21/2 inches long and is fully formed. During the second and third trimesters, it will grow and mature. The urine produced by the fetus's kidneys is excreted into the amniotic fluid. (don't worry; the urine is sterile and is carried away as the fluid is replaced.) your baby's face is now properly formed and eyelids are present. The umbilical cord has started to circulate blood between the embryo and the placenta.
13 the fetus is now about three inches long and weighs about 11/2 ounces. Its internal organs are up and running: the liver is manufacturing bile, and the kidneys are secreting urine into the bladder. This is the week when its intestines migrate from the umbilical cord to the abdomen. The fetus has already acquired some reflexes, and its eyes and ears have almost assumed their permanent positions.
14 by the end of week 14âthe last week of the first trimesterâthe fetus is 31/2 inches long and weighs up to two ounces. Its hands are functional and it is able to "breathe" amniotic fluid in and out of its lungs. The internal organs are fully formed, although the lungs, liver, kidney, and intestine will continue to grow and mature.