Spotting OR Implantation bleeding?? Help

K
So 2 days ago (Tuesday) I spotted just a little like light pink and I was on cycle day 25 and the way AF goes with me I usually get AF between cycle day 29-35 somewhere around there. 
I also spotted just a tiny bit less the next day (Wednesday) and nothing else the rest of Wednesday and today I still have not seen any sporting at all. But I do have a mild headache, mild fatigue, on and off mild nausea and no energy. 
Has anyone else spotted for a day or 2 and then nothing and then days later AF arrives? 
Or did I experience Implantation bleeding? Or could there be something else medically wrong with me? 
Thanx in advanced.