Really disheartened today

Lauren • We've been married since October 2015. Originally we wanted to wait a few years before trying for a baby but it seems my heart had other ideas!!!
So today I'm 15 dpo. Had some bizarre bodily moments over past week and yesterday I gave in and bought a cheap test. It was bfn. Af due tomorrow and already feeling like she's just waiting to come at me in the morning. I dunno. Maybe this just isn't meant to be. Has anyone else ever had a bfn on 14 dpo and then gone on to have a bfp?