How does Lolo work?

Birth control pills such as Lolo help reduce the chances of pregnancy in two ways. Firstly they inhibit the monthly release of an egg(s) by your ovaries. Secondly, changes in both the endometrium (lining of the womb) and the mucus produced by the cervix (opening of the uterus) occur with the use of birth control pills.

Why is that important? It makes it less likely that a sperm will penetrate an egg, or for an egg to implant on the wall of the uterus.