So I am about 5-6dpo (positive opk). Had intercourse with my husband this morning, 2hrs later had a little spotting, only once when I wiped. Then nothing until now, it's light brown/pink mixed with egg white cm. My back hurts a little but I've been doing yard work and moving stuff around, and I'm extra cranky. My period isn't due for another 9 days (glow says)...so... could this be early implantation or something else??