please help me

Deana
This is going to be long and a lil tmi but please someone help me. Ok so at first I thought I may be pregnant but now I just don't know. I wasn't supposed to start my period until the 23rd. Well the 18th I started spotting. I had some cramping that night, I barely slept. Well the next day I just barely spot, no cramps, same for the next couple days. Today is the 22nd and now I'm bleeding lightly. I don't know if this is my period because I have never ever had a light period. They have always been very dark bloody and clotty. Sorry for tmi but this barely spotting and bleeding thing has never happened before and I usually am in severe pain the first three days of my period, I stay in bed with a hot water bottle. I have minimal cramps every now and then they feel more like gotta poo cramps then anything. Someone please tell me what's going on here??