Implantation bleeding-2 days before AF

So last night.. 2 days before AF arrives i went to the toilet.. i wiped and could see light brown slippery type discharge.. i thought here goes.. AF has arrived. However, today no sign. No more light brown type discharge.. however i have had a little bottom back ache accompanied with quite sore tender boobs. Ive taken a paracetamol and there is no longer any aches. I have thought could it be implantation bleeding? Last tuesday i i took a cheapy sainsburys own preg test and it ha a faint positive, same again on wed. I took a FR test and it showed nothing. Again that has happened yesterday and the day before. hmmm.. im confused. Could it be implantation bleeding?

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