AF or implantation?!

So af is due tomorrow, and I've been having cramping every day for about a week now (I typically do not get cramps with af), I'm about 14 dpo now. Also some random nausea last week but nothing consistent. Also heightened since a smell a bit and noticed some blowing. I got a bfn on Monday (11 dpo) but this morning I noticed some very light pink when I wiped. Nothing since, and nothing on a panty liner at all either. What do you think, af on her way or implantation bleeding?! We had a mc in January and I want our rainbow baby more than anything!!!