Starting the Opill birth control for breast enlargement can be risky. Use of birth control pills for a long time can cause problems such as high chances of blood clots, weight change, and emotional state. The hormone progestin in the pill can affect my levels of hormones. There are also claims that birth control pills made of progestin can affect the production of hormones. Consult your healthcare provider to make a safe decision and avoid risking negative consequences. 

Men who are transgenders assigned female at birth still possess uterus, and consequently continue to menstruate as normal. Hormone therapy commonly used in the gender transition brings about a significant decrease or cessation of menstrual bleeding. In order to get personalized advice regarding the management of menstrual health for those going through gender transition, a specialist in transgender medicine or endocrinology needs to be consulted.

FMGA surgery DOES NOT allow for biological pregnancy.. 

It is usually not recommended to get top surgery at 13. One should atleast be 18 years of age to get top surgery. 

Usually, top surgery is suggested when you are 18 or above the age of 18. But you can get top surgery at 16 if you have your parents approval and after consulting with a qualified doctor. 

If you don't take testosterone or undergo top surgery, you can still build your pecs by lifting weights. Pecs, short for pectoral muscles, can grow with exercises like chest presses and push-ups, which target these muscles. Pace yourself, use the correct form, and be consistent with your workouts. Your pecs can still develop even without testosterone.

It seems like you may be going through some changes about turning into the opposite sex. Understand that these changes are complicated and might need some medical interventions. You might require different amounts of hormones to help you through the process. Talk about what is bothering you and your symptoms with a doctor who can help you figure out the best way forward.