I woke up this morning and went to the bathroom and seemed to be starting my period. This is around the normal time. As the day went on, I have had no blood on my pad and when I go to the bathroom I don't have a bloody flow but I can wipe some blood from myself. I do not think I'm pregnant because my period came on time last month and since then I have not had unsafe sex. I also took a pregnancy test about a week ago and it was negative. So I'm pretty sure I'm not pregnant. What could be causing this? Should I wait a day and see if it becomes normal?