Everyone is used to the expression that pregnancy lasts 9 months. But obstetricians keep their own calendar, where there are exactly 4 weeks in each month.
Thus, a 40 week pregnancy (280 days) consists of 10 obstetric months. It is really more convenient to count this way, because the days in a regular calendar are unevenly distributed over the months: sometimes 30 days, then 31, or even 28! And the obstetric calendar allows you to calculate everything very accurately.
Growth by the end of 1 month: 0.36 mm wide and 1 mm long.
The fertilization of the egg takes place around the second week of the first month. A week later, the ovum is implanted into the uterus. Around it, the placenta, umbilical cord, amniotic fluid are gradually formed, and the ovum turns into an embryo.
Finally, the baby's autonomous nutrition system will be formed by the 12th week of pregnancy, and now, for now, a special temporary gland - the corpus luteum - helps the placenta.
By the end of the first month, the child already has ectoderm - the rudiment of brain cells, misoderm - future blood, skeleton, muscles, genitourinary system, and endoderm - the basis for the formation of glands and the gastrointestinal tract.
Mom experiences all the delights of hormonal changes in the body. Estrogen and progesterone, which her body begins to produce, lead not only to unpleasant toxicosis, but also to psychological difficulties: increased excitability, tearfulness, depressed mood.
By the end of the first month, a woman may not yet know that she is pregnant. However, the first signs may be mood swings and increased urination, as well as an increase and soreness in the chest and drowsiness.
If desired, you can do a test for hCG (human chorionic gonadotropin) - a hormone, the increased content of which in the blood is a clear sign of pregnancy. But it's better to wait with the test until 6-7 weeks after the start of the last menstruation. Then the analyzes will be more accurate.
Conception - 1 month - 2 months