Ughhh so confused

Elena

I was due to start af today. Yesterday I had what I thought was af when I wiped ( brown pink tint) , put a tampon in and went about my day. But at night when I took it out there was nothing. And there hasn’t been anything since. Took a test this morning but of course bfn.

Has anyone had something like this happen that ended in a bfp after their af didn’t show but had some spotting before? I never spot and always start af like clockwork.