Any insight welcome, thanks

Kelly
So this is my first month using opk and got a positive on cd 17 along with ewcm sorry for the tmi. So started spotting a orange pinky colour from 5dpo which today seems to have turned into my period at only 7dpo and a week early. Anybody any ideas why this could have happened also having cramps and feel in a terrible mood so definately feels like af. 😢