Some people dear not all. I had a client who hasnt seen her period and got pregnant 3 months after having her baby. She dint even know she was pregnant cos she relied on d fact that her period hasnt returned. That's why we advice women go for family planning six weeks after delivery.

Some people doesn't get pregnant when breast feeding when dey stop dey get pregnant, that is d best family planning God gave to dem

Lactational Amenorrhea is a form of family planning but its not reliable cos some women ovulate even without menstruation, visit d family planning unit of a govt hosp near u. They will give u detailed explanation abt each type of FP and do some minor investigations to help u make d best choice.