The pain began a couple of days ago but still hasn't gone away. It occurs on my lower abdomen, a little to the right side. It hurts like a bad cramp, and when I press down on it it hurts even more. My period is over 2 weeks late this month. However, I have not had unsafe sex. Just to make sure, I took a pregnancy test and the results were negative. Also, I've been having to urinate more than usual. More often that not, when I sit down to urinate hardly anything comes out, although the sensation still remains a little. Should I be concerned about this, or might it be just be menstruation symptoms?