How young is too young

As this is my first post in my baby Barker blog, I thought I would touch on the subject of age and trying to conceive. I believe that I was stupid when I was 15-17 wanting to have a baby. I was no where near ready, physically or emotionally. I was unstable from what had happened to me as a child. I wanted to prove that I would have a better family than I was raised in. My fiance feels the same way but for a different reason. I know I'm still very young for ttcing at age 18. I'm not sure if I'm ready yet still but with fertility problems on both sides as we get older, it's now or never.Which is why I go by the saying babies don't wait for you to be ready.