So is this my period coming early or implantation bleeding because I'm extremely confused. Any feedback will help

So my af is due on the 27th..well today when I went to the bathroom and wiped I had blood. So automatically I'm thinking I'm out. I haven't had any cramps or anything and all of a sudden the blood stops. I've had a panty liner on and I haven't had to change it. There is a small quarter size amount of pink blood. Everytime after that I've looked at the tissue and it's either extremely light pink or nothing at all