What is wrong with me?

The last time I had my period was August 4th. So I am officially a month late. I just recently went to the doctor and had a pap and some blood work. My bloodwork came back ok - not pregnant and no thyroid problems or anything. My pap came back as having "reacitve" cells. I'm not stressed no sudden weight gain/loss. I I haven't been eating too well lately, I loss my apetite when I start to eat. Any ideas what the problem is?