Could i be having implantation bleeding already??

Katelin • I have 2 little boys ones about to be 2 and the other will be 2 mos Nov 19th!(:
My periods usually last 7 days so for it to last THAT long is a little weird. i think it may be off on the ovulation days.. but i started spotting pink today with cramps and nausea. could i have a chance?? i had sex the 26th 28th and 30th. It said my most important day was 28th. With a 33%chance. Really wantin another! btw . the spotting its REALLY pink.