AF or implatation?

gin

I started light spotting with light cramping 8dpo (there’s a bit more in the morning, then it mostly goes away throughout the day) for 5 days now. I do have a cervical polyp, but that usually only bleeds for an hour after BDing which we haven’t done since 5dpo.

Today is 13dpo and I got a BFN, but have also been experiencing waves of nausea in the last 2 days, I basically feel hungover even though I haven’t had a drink in weeks. I’ve never had this type of spotting before, even with my first pregnancy. I have a regular (within 4 days every month) heavy period, AF is due sometime in the next few days. Anyone ever experience something like this, what was the result?