Ovulation question

Samantha

So I was on depo for 2 years and got off in June last year I started taking ovulation test September of 2017 but never got a positive to March ,27,18 so me and hubby BD and I’ve been not feeling so well the last few days along with cramping in the lower middle of my abdomen . Could this be signs of implant ? Is there I chance I could be pregnant this coming up cycle ?