My period isn't do till a week, but I'm haveing heavy bleeding. Can it be implantation bleeding?

Early Bleeding. It is not likely that bleeding heavy like a period is due to implantation. The list of possible causes can include fibroids, polyps, ovulation abnormalities, pcos and pregnancy problems. If this persists or a pregnancy test is positive, be sure to check with your physician. Monitoring basal body temperatures and charting them is a great way to monitor what is going on with your cycle.