so confused

Ashlee
I am no on cd 31. I was supposed to start my period 2 days ago. Last night went to the bathroom wiped pink. Thought my period was here. I've had nothing since. I've taken a pregnancy test and it came back negative a few days ago. I have had dizziness feeling like getting sick and cramps but other then that no other symptoms. What do you ladies think? I'm driving my self crazy!!