I REALLY have a feeling I am gonna have a real short LP this cycle

It's usually 14 days, and I am only 8 DPO...but I had spotting already and I have had cramps...yesterday it felt just like AF cramps.
I know, it seems I am jumping the gun on this one, but really...I can't have a chart looking so good and then not feel more disappointed than ever...it just doesn't work that way.
My temp going down today didn't make me feel any better either. Agghh!!