Brown spotting at 13dpo... bfp?

We are TTC#2 on month 5! This morning my period was due (13 dpo) but I woke up to brown spotting and some snotty cm when I wiped. I assumed af was coming so I threw a pad in and went about my business, but she never showed all day! (Very unusual for me. It’s usually heavy flow right away, it doesn’t mess around with show/no show) So now my next question... anyone else ever experience that and go on to have a bfp? I assumed it was impossible... but now I’m wondering... I will test in the AM, just in case 😊