If the women is exclusively breast feeding then for 1st 3 months no contraception

1.if the women is exclusively breast feeding then for 1st 3 months no contraception is used and after 3 months onward is POP is used or OCP is used? And for how many period they r used?
2.if non breastfeeding women then 1st 3wks no contraception used. After 3wks which contraceptive is used for what period?
Confused mam pls clarify

Lactation: POP is the contraceptive of choice. Non-breastfeeding women till 6 weeks only POP is given, after which OCP can be given.

Thank you.