I have been bleeding heavy for the past 2 days. It's dark black and brown with a little tiny of light red. I'm also experiencing intense cramps. My last period was 2 weeks ago and was 5 days late. It lasted 2 days but was a really heavy flow. My boyfriend and I do have some unprotected sex, but he always puts a condom on before it gets too serious. I am expecting my next period in about two weeks. What could this possibly be?