AF due in 4 days, negative test

Feeling a bit defeated. I used a dollar store assured brand and it was BFN, not even a vvvfl. I'm about 10/11dpo. I know it could still be positive, but I've been cramping, so I know she will show.

I am just ready to start over. My plan for next month is to use opk for the first time. What affordable brand is the best? Any other pieces of advice?