I have received 5 positive pregnancy tests, i believe i'm around 6 weeks. but i have had light bleeding for about 4 weeks, is this normal?

Probably not: One can contact her Ob-Gyn doctor to describe the bleeding and see if any evaluation should be done now (presuming that "bleeding" means blood from the vagina, that is more than a tiny bit of spotting). It's good to make sure there is not an ectopic pregnancy because an ectopic can lead to life-threatening complications if it is not stopped. The doctor can help decide what to do next.