I was getting very regular with my periods... 28-32 days apart, always lasting exactly 6 days.
Then..last month, it was very different. I FELT ovulation, which I know is normal, but it was the first time for me. Then I started having signs of pregnancy according to about 100 forums of womens' experiences. Definitely thought I was pregnant, then at "2 weeks" (one day after my period was due, 2 weeks after most likely "conception"), I had a sudden flush of blood. I passed out at work it was so heavy. Then I proceeded to bleed for 13 days.
I cannot afford a doctor and the only free clinics in my area are in REALLY bad parts of town. (Like on national lists of most dangerous places to go)