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Early symptoms of pregnancy won't appear earlier than 1 week of pregnancy. The very first thing an attentive woman can notice is the delay of menstruation. Normally, the menstrual cycle can shift no more than ± 3 days. Many women (but not everyone) can experience a small amount of spotting that may occur during implantation (it's the process of introducing the fertilized egg into the wall of the uterus), which is less in quantity and duration than a normal period. An increased level of basal temperature persists from the moment of ovulation (37.1-37.3 degrees Celsius); outside of ovulation and pregnancy or acute illnesses the temperature in the rectum will be about 36.4-36.7 degrees Celsius. Pregnant women also become more sensitive to various odors. Symptoms of toxicosis (nausea, vomiting) usually begin at 3-4 weeks of pregnancy and reach a peak between 9 and 16 weeks and normally disappear completely by 22 weeks.
hCG (human chorionic gonadotropin) typically begins secreting by the trophoblast (the outer membrane of the blastocyst), which was built by 5-6 days from fertilization for the purposes to maintain pregnancy, block the menstrual cycle and stimulate the synthesis of estrogen and progesterone.
The clinical significance of hCG appears after implantation of the embryo to the walls of the uterus (it happens by 5-7 day after fertilization). Reference values of hCG of men and non-pregnant women about 0–5 mU/ml. Values ranging from 5 to 25 mU/ml do not allow to confirm or deny the diagnosis, so we need to wait 3 days, because hCG increases about 2 times every 72 hours.
hCG reaches his peak (225,000 mU/ml) at 6-11 weeks of pregnancy, so, early symptoms of pregnancy will also be more pronounced, and then the hormone begins to gradually decrease until childbirth.