What Causes A Delayed Period With Discharges, Stomach Cramping And Headaches?

hello, i am 7 days late on my period. I recently stopped taking my birth control pill about a month ago. I took two home pregnancy tests and both came up neg. I have weird cramping near my stomach. I had two headaches which is very rare for me, i never get head aches. Also i have white stretchy discharge? Could i be pregnant?