Method - injection, implant, mini-pill, intrauterine system.
Hormones included - progesterone
How it works - Stimulates the production of thick cervical mucus making it less likely that any sperm will get through. Thins lining of the uterus to reduce the chance of pregnancy. Prevents ovulation by stopping the production of FSH and LH.
Method - combined pill, patch.
Hormones included - progesterone and oestrogen
How it works - all the effects above, plus oestrogen also prevents ovulation.