Answers please

Ashley • I'm 24 years old. Married 3 years now. My husband and I have kids, I have a 5 year old girl, and he has a 6 year old boy. We don't have any together! Been TTC since 09/17/2013 Wish us luck 😉

So I started my cycle two days early and I'm having cramps on my lower stomach and pain in my lower back. My period is a dark brown almost black. I've never had this happen at the beginning on my cycle it's always been pink and at the end of my cycle I might have a little brown but never at the beginning and it's a lot. What does this mean and what should I do?