First response tests

Lisa • Married for 4 years and together for 9. TTC #1. Diagnosed male factor infertility. Struggling but still hopeful.
So it's two days before I'm supposed to get my period and I took a first response pregnancy test and got a BFN.  According to the box >99% of pregnant women get a BFP on the test at two days before expected period.  So am I out for this month, or do I still stand a chance?