Please help!! Has anyone experienced this?!

Since last night I have had very minimal Brown spotting. I have had a pad on, but there is nothing on it, only a drop or two when I wipe. I have 12dpo. Also am very tired and have slight cramps. This is different than AF because I would have started my period this morning if I had spotting last night. Spotting very minimal today as well. Has anyone experienced this. What is it?! Implantation?! Please help!! Also have been urinating about every hour! Cant stop peeing!!