What is the best and most effective birth control method to use so in the future u can still have childern?

Progesterone IUD. Mirena (levonorgestrel) and skyla are iud's - they are the most effective form of birth control that still give you the ability to have children in the future. They can last up to 5 and 3 years respectively. They shorten and lighten menstrual periods. Some women will stop their periods all together. They are very safe and rapid return to fertility is normal after removal.