OMG?! Please read

So today I’m 13dpo. Should be getting my period tomorrow but I don’t feel how I usually feel before my period Its like I know it’s not coming. I been cramping for two weeks straight lightly and I NEVER cramp that early before my period typically I’d be having bad cramps today but I’m not even having cramps it’s just when I sit up or move to harshly my lower stomach tightens up. I tested on 8dpo and 10dpo but both negative help??! I was cramping since 6dpo