Implantation bleeding?

I have been trying to get pregnant but kept failing for 3 years now... the past few week ives been sick had the crying spells nipples hurt so bad its keeping me awake my husband has been sick n all..my period was due tomorrow but today im experience very light spotting ive had on a pad since this morning thinking my period was coming but nope i just notice small blood no clots when i wipe the only time i can even get it on the tissue is by sticking it up inside me.....what does this mean?