What could this mean.....

Well, I am 10 days post IUI, and of course today would be the day I would spot. I am a nervous wreck right now, and I keep praying it is implantation bleeding. It is so hard to remain positive when all I want to do is cry and believe that this is never going to happen. Luckily enough, my hubby has been very supportive today, but I still can't help but to feel hopeless. Dear god, please make this just be some implantation bleeding!!