Implantation??

Alysha

I've taken quite a few what looks like faint positives, including one today. I started cramping just a bit comes and goes, and isn't as intense as my period cramps, I also started spotting. No clots and not filling up a pad. I'm 11 dpo and I'm just wondering if you guys think it is implantation? And how long implantation is supposed to last?