What is happening with my body??

Hi. We have been TTC for 3 months.  AF was due at 14dpo. I had very light pink spotting only when I wiped pretty much all day. But then nothing for 2 days. Today I have a little bit more spotting but barely even worth mentioning.  I'm only 3 months off of oral birth control but have never had spotting or a light period like this. First cycle was light but last month seemed very regular for me.  I took a hpt this morning and it was BFN.  Later this afternoon I noticed my breasts have little bumps on the nipple and Google says that's a symptom of early pregnancy.  If this wasn't AF and possibly IB, then wouldn't I be showing BFP  by now? Today, I'm at 17dpo. Not sure what to think but still holding on hope that I will get a BFP.  Anyone have similar experience with a late implantation or delayed positive test?