Generally a woman’s hCG levels double every 72 hours. hCG levels reach their peak in the first 8-11 weeks or pregnancy and then they will tend to level off for the next two trimesters. This is why in the first trimester (3 months) of pregnancy symptoms can be so much stronger and intense.. Most women will never know their hCG levels in pregnancy. Typically a urine test for the mere presence of hCG alone is sufficient for your obstetrical care in pregnancy. Looking at the specific levels is done if there is a complication or a suspected complication. Common reasons to do a blood test can include concern over the loss of the pregnancy (as in a suspected miscarriage, or ectopic . Human chorionic gonadotropin, or hCG, is a hormone produced during pregnancy in the cells of the placenta. Especially in early pregnancy, the amount of hCG present in the mother's body rises rapidly. In fact, it is the hormone detected in the urine by. Human Chorionic Gonadotropin which is commonly known as hCG is an important hormone especially during early pregnancy. It is manufactured and secreted by the cells which eventually end up as the placenta.. Normal hCG levels in pregnancy vary, but when women test above 25 mIU/mL, they’re pregnant. hCG levels can reach a height of nearly 300,000 mIU/mL by 9-12 weeks. Low levels do not necessarily mean an unhealthy pregnancy, but hCG levels can be rechecked every 48 to 72 hours.. During pregnancy, your body produces the hormone human chorionic gonadotropin (hCG). It can be detected by your doctor via a blood test roughly 11 days after conception and via a urine test approximately 12 to 14 days after conception. The level of this hormone usually reaches its peak between the second and third months of pregnancy and then drops..