How long should you wait before taking a pregnancy test if you have erratic periods?
Don't wait because with eratic periods you could go a very long time without knowing your pregnant, And you need to get prenatal care and get on prenatal vitamins. It can be especially dangerous not knowing if you're pregnant if you drink or do drugs. Even if you don't do it heavily, the begining stages of pregnancy are the most crucial. So if you suspect it, take it seriously.