More precisely, the particle is a quantized manifestation of a field (the Higgs field) that generates mass through its interaction with other particles.
1 When you stop taking it, you will get your period within 2 to 3 days. 2  However, this is not 100% effective. 3  Women have reported bleeding or spotting while taking progestogen pills. 4  There are now contraceptive shots and even contraceptive implants that stop your period altogether for months in a row. There are in fact contraceptive pills made specifically to stop your period. 2  They are called extended-cycle pills. 3  You would normally take these continuously for three to six months, and then take placebos for a week during which you would get your period.
First, the progestin-only pill thickens the mucus between your uterus and your vagina. Sperm have a hard time getting through the thick mucus to reach the egg. Second, like regular birth control pills, the progestin-only pill makes your body think that you are pregnant and stops your ovary from releasing an egg. This does not happen as often as with combination birth control pills. Forty percent of women taking the progestin only pill will continue to ovulate.