Never on birth control. thought i might be pregnant with positive hpt test. period won't stop bleeding for 8 days in a row. what is happening?

Called Menorrhagia: Menorrhagia = ↑ed duration ;/or severity menses. Many possibilities, including increased thickness/growth of the uterine lining, uterine polyps, early side effect of pregnancy, endometriosis, fibroids, infection, emotional stress, ovary ;/or hypothalamic changes hormone control. Slowed blood clotting, cancer, etc. If continuing, best seek assistance from someone worthy of your trust.