About 8-10 days DPO, wierd cramping....?

I don't usually cramp before my periods, I usually start on day 35 then have cramps that night and day two is like hell for me then ends morning of day 3. I am having odd cramps and twinges, I kept thinking my period would start when I wiped and nothing, my feel firmer and heavy, my are sensitive to touch and are erect more. I am sleeping more, I took a nap this afternoon in my car and almost didn't wake up for work. AF is due this coming friday/saturday so I am definetly waiting to see if it shows, just wondering what everyone thought. I've heard a lot of women feel like their AF is coming and it just doesn't show...