Af due today light pink blood now nothing at all

I've had light cramping af was due today i went pee and wiped I had light pink on the toilet paper mixed with thick creamy cm. I put n a tampon to monitor things and a few hours later I took it out and only had the tiniest bit of light pink with some dark brown blood with the cm. I've cried at almost everything these past two weeks I have had horrible headaches I just felt pregnant what do you think is going on? I just went to the bathroom and there is nothing there at all!!