Implantation??

So I'm four days till AF today and 9dpo. Checked cervix today and had some brownish cm when pulled finger out. Had the usual 2ww symptoms, sore boobs (always sore between ov and af) but I do think they look a little more veiny than usual and do feel big. What does everyone think? Early af or bfp coming? Had cramps tonight on and off, usually get AWFUL cramps with af and this is just mild.