Helo,I got my period a day after de due date,but its watery n thin.... what could be the cause cos I have not taƙen any birth control pills before.didnt hv penetrative sex, though I hv been emotionally stressed n worried abt a few things,could stress be a factor to this,or sumtin else. I heard it could be implantation bleeding but I didn't have sex so what could be the issue.