Weeks 0 – 4
As soon as the ovulation occurs by combining the sperm and egg, the cell division starts immediately in the uterus that eventually ends up in taking a form of small baby. During the first four weeks, women hardly realize that they are pregnant, though immense activities start inside their bodies. All the major organs of your baby start developing by this time. During this phase of pregnancy, all the major development starts including placenta, the amniotic sac and the amniotic fluid.
The baby starts developing right before it is actually attached itself to the uterine lining. The implantation of your baby in the uterus takes almost 10 days after the fertilization. Right from the start, the major organs like heart, lungs and spinal cord of your baby start developing. It only takes three weeks before your baby’s heart begins pumping blood independently.
In the fourth week, your baby will weigh about .03 ounce and measure around 1/8 of an inch in length.
Once the fertilization is done, your body automatically starts releasing progesterone in high quantity so as to avoid menstruation and also to ensure healthy pregnancy. In the beginning, these hormones are produced by the ovary, but once the development of placenta completes, this task is taken over by it.
The uterine lining thickens with the production of progesterone and also the blood supply also increases. The cervix fused tight with the mucus as well. In a meanwhile, your uterus starts getting bigger and softer to entertain implantation process.
During the enlargement of your uterus, you may observe some pre-menstrual type cramping. You may even feel to urinate every so often because of the increased metabolic rate and growth. Fatigue will become an obvious part of your life as a lot of activities are going on in your body and you often feel tired, wearisome and even faintness. Also, these hormones set on the menstruation process in the mammary gland that can result in breast tenderness or swelling.
During the first month, women hardly notice that they are pregnant, though a lot of changes occurring in their bodies, yet it takes some time before you feel like pregnant.
Next: 2 Months Pregnant