One of the most important things you can do for your body and health and that of your future child is to make sure that your nutrient levels are balanced. Many women don't realize that nutrient deficiencies can affect fertility and carrying a baby full-term.
The very birth control pills that many of us took for years may still be preventing pregnancy, even years beyond when we stop taking them. A huge part of this is B vitamins.
Birth control pills are known to deplete your body of B vitamins, which work synergistically to perform many functions in the body -- including hormone balancing.
Folate (which is listed as folic acid on most supplements and is one of the B vitamins) aids in neural tube development and deficiencies can cause miscarriages. And B6 and B12 in particular can help increase the chance of conception by balancing your estrogen and progesterone levels.
If you were on birth control pills long-term before trying to conceive, consider nutrient testing to know your vitamin and mineral levels. This can start you on the process of supplementing and changing your diet to give your fertility a boost.