Has anyone had mulitple BFN's and were still pregnant

Cassie • Momma of Two Graci 5-7-15 Graeson 9-7-16! Angel Momma of Two Nov 2015 and Twin B Jan 19 2016! Single Momma! TTC baby 3 via Sperm Donor! :) ❤️💜
I was wondering does it take longer for some women to test positive than other cuz ive had multiple BFN from dollar store tests and i M now 4 days late for AF im loosing hope here!!!