Implantation Bleeding differences

Hey y'all, I've had 3 pregnancies and never noticed implantation bleeding. I'm pretty fricken sure I'm pregnant now.. Crazy emotions, nausea a lot of the time, food aversions, headaches, sleep problems, weird dreams, fatigue from hell, sore and growing boobies, bloating, and tasting metals when I drink water. I know all of these symptoms don't mean that I'm pregnant, for sure. Just all of them now, kinda points to that. But I know it's not for certain. ANYWAYS, today I'm two days before my period, about 10 days from conception I imagine.. maybe 12 and I'm having very light and light colored spotting. To me, it's pointing toward implantation with the very slight cramping, spotting, and weird tingling feeling going on down there.

Has anyone else had pregnancies where they didn't notice implantation bleeding and then had implantation bleeding on another pregnancy?