What is the best way to increase estrogen levels in my body without taking birth control?

Why do you ask. If you are having period problems (such as missing your periods) and your estrogen levels have been tested and are too low, you need to address the cause. Causes can include: being underweight, too much exercise, or an eating disorder or other medical problems. Your body is giving you a message, and you must listen to it. There are no foods or other ways to increase the levels.
Not that way. Birth control pills lower the estrogen levels in your body by suppressing ovarian secretion of the hormone.