When taken every day, at the same time, Viorele is very effective at preventing pregnancy. It does this by changing the hormone levels in your body, which in turn changes how your body goes about its business every month.
First off, your pill is on a mission to stop ovulation. That’s when your ovary will release an egg, which can then be fertilized. Blocking ovulation is enough on its own but, because ovulation doesn’t stop every month for everyone who takes hormonal birth control, the pill has a few other tricks up its sleeve.
Normally, the lining of your uterus would get thicker over the course of the month. This makes it a bit more welcoming for a fertilized egg — like a nice, fluffy mattress. The pill keeps the uterine lining from growing, so the egg (which is quite picky) takes one look and cancels its reservation.
The last bit involves the mucus in your cervix. Unlike the lining in your uterus, your cervical mucus becomes thicker when you take Viorele, so sperm have a harder time swimming through it.