Implantation spotting??

o.k. I "o" 16th /17th. on the 22nd /23rd i had some mild twinges in my abdoman, on the 24th my started to get mildy sore. On the 25th my s got extremely sore to the touch(they have never been this sore) on the 26th when i used the bathroom and wiped i had a small lite pink spot on the paper, this happened 3 times that nite then it was gone. i have been more tired and hungry then normal. my husband says i am very moody . "af" is due 1/31-2/1 . i know it is too early but i took a test this am and was neg. what do you think? could it be?