Advice needed

Not knowing what's going on here. I came off birth control at the end of November and had my period. Then I had my period starting December 29 and lasting 5 days. in January I used ovulating strips and I had an LH surge on January 13 and 14, so I assume I ovulated around then. I am now a week late and took a test this morning and got a BFN. I don't feel AF coming at all, but I am usually not late like this and can feel my period coming on. Does anyone have any insight? Could I still be pregnant? i would think it would show up on a test by now:(