First Symptoms of Pregnancy: Hormones and First Hormonal Changes

A woman may experience various symptoms in early pregnancy or the first weeks, usually around six weeks.

During conception and early pregnancy, some of the following symptoms may be included:

  • Light bleeding
  • Changes in blood flow.
  • Changes in the nipple.
  • Go to the bathroom more often.
  • Swelling, cramps, and back pain.
  • Nausea of ​​pregnancy.
  • Increase in saliva
  • Dizziness and fainting.
  • Tiredness and exhaustion.
  • Headaches.
  • Constipation and winds.
  • Changes in libido in early pregnancy.

During most conception and pregnancy, research shows that babies are conceived around two weeks before their next period; the concept begins two weeks after their last average period. Vision is usually performed when the sperm fertilizes the ovum in the fallopian tube, and it takes another six days for the newly fertilized egg to reach the uterus.

It may take another six days for the fertilized egg – or the newly conceived baby – to fully implement the uterus lining and interact with the woman’s body. Once the baby is implanted fully into the uterus, a hormone called the human gonadotropin hormone is released, it is released into the bloodstream.

Hormones and pregnancy symptoms

Hormone levels also provide the basis for detecting a pregnancy with a traditional test. The early signs of pregnancy do not become evident until 12 to 14 days after fertilization.

Pregnant women with twins or triplets may notice their signs of pregnancy easier because they are more intense. Other hormones increase during pregnancy, such as progesterone and some estrogen, contributing to many of the first physical signs of pregnancy.

The first hormonal changes in pregnancy

Progesterone is a female hormone composed mainly of the corpus luteum in the ovary and the placenta.


The progesterone prepares the lining (endometrium) of the uterus (womb) to receive and hold the fertilized egg, vital for a successful pregnancy. It also rises before menstruation, so premenstrual symptoms can be mistaken for early signs of pregnancy. The pregnancy symptoms are not a guaranteed sign that a woman is pregnant. Remember, every woman and pregnancy is different, so there is no need to panic if you do not have all the pregnancy symptoms.

Only a pregnancy test performed around six weeks of gestation can confirm a pregnancy correctly. Many of the early pregnancy symptoms will be similar to those experienced before menstruation (abdominal distension, fatigue, and breast tenderness), so it can be challenging to know if it is another menstrual period or the arrival of motherhood.