Any chance I can still be pregnant?

bd'd through fertility window.4/2 skipped 5th 4/09. 6DPO tingly bbs on and off. Lost all symtoms from 9DPO. Now 12 dpo took hpt bfn. Bbs are tingly again. Twinging at work x's3 on left side then on right once when I got home could I still get a bfp or should I just close this cycle :0( ?