Pregnant, bleeding, clotting, cramping, feels dizzy. Still pregnant?

Hi, thank you. Had a positive pregnancy test at about 4-5 weeks. Then began bleeding for two days. The bleeding resembled that of a normal period for the most part, except that it ranged in colors, from brownish to bright red. I also noticed a little clotting. One of these nights i also experienced some moderate cramping, and was also experiencing regular dizzy spells, mostly in the evenings. After the bleeding subsided I retested another two times and both tests were still positive. I am wondering if I could still be pregnant ir if the hormones are still in my system ten days after the bleeding? Also the dizziness has nearly gone away completely.??!!