Hormonal birth control supplies a continuous level of progestin and/or estrogen daily. This steady source of hormone aids birth control prevent ovulation. In order to get pregnant, then there must be an egg to get your sperm to fertilize. So, when birth control ceases ovulation, an egg isn’t released from the gut. With no egg for the sperm to combine, pregnancy is prevented.
Combination birth control methods (such as the birth control pill, the patch, and NuvaRing) have the main goal each month of preventing your body from releasing an egg. From time to time, progestin-only birth control (such as Depo-Provera, the minipill, Mirena, Nexplanon, and Skyla) may also do this. The estrogen and/or progestin found in such methods can lead to birth control to stop ovulation.
How Does Birth Control Stop Ovulation?
Hormonal birth control prevents ovulation because it prevents the signal that triggers both key hormones that are involved in ovulation: FSH and LH. Both of these hormones will begin to be produced if your body finds out a lack of estrogen and progesterone.
- Hormonal birth control supplies only enough synthetic estrogen and progesterone hormones to avoid the stimulation of FSH and LH production.
- Normally, the hypothalamus in your brain detects if your estrogen levels are reduced, typically through the first days of your menstrual cycle.
- Your hypothalamus releases gonadotropin-releasing hormone (GnRH). This is the hormone which signals the pituitary gland in a different part of the brain to make follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
- Considering that your thyroid gland never gets this message, it doesn’t produce follicle stimulating hormone (FSH). With no release of FSH, there is absolutely no sign to activate the growth and development of egg follicles in the ovaries.
- Ovulation normally occurs after there’s a surge of luteinizing hormone (LH) and an egg has been released from the gut. With hormonal birth control, there is nothing to trigger the luteinizing hormone (LH) surge, so the egg’s discharge isn’t triggered and ovulation doesn’t take place.
- Hormonal birth control essentially keeps you at the exact same phase of your menstrual cycle on a constant basis, skipping the release of GnRH and stopping ovulation from occurring. The ovary becomes comparatively inactive.
Why Does It Really Matter Whether Birth Control Stops Ovulation?
For some girls, it’s a matter of their personal ethics, ethics, or religion regarding if their birth control procedure stops ovulation, fertilization, or the implantation of the fertilized ovum. For people who believe life begins when the egg is fertilized (sometimes ), preventing the release of an ovum might be an acceptable action, but preventing pregnancy after the egg is fertilized might not be satisfactory.
It’s typical for hormonal birth control to produce all three effects. Ovulation might be prevented by the continuous degree of these synthetic hormones. Progestin keeps the cervical mucus viscous so sperm can’t enter the uterus and fallopian tubes to fertilize an egg.
Additionally, it keeps the uterine lining in a state that doesn’t encourage implantation and nourishment of the fertilized egg.
Combination hormonal birth control ceases ovulation. Progestin-only birth control simply stops ovulation in about 40 percent of women, but its other effects on the cervical mucus and esophageal lining act to prevent pregnancy if ovulation occurs.