What Are The Chances Of Pregnancy Having Dark Periods And Frequent Urination?

Hi, I have a question about the possibility of me being pregnant or not and if so what should I be looking for? See I know the main symptoms and what not, my problem is that I have some symptoms but I also had a period June24th 2010, And in February I believe the 28th? I went through a miscarriage. I cant afford to get a test at the time or a way to my primary care taker. I'm nervous. I am having constant urination, Cant even go near a cigarrete when before I would fly through a pack a day and more. But yet I had a dark period that lasted 4days. Could I be?