from what i've looked at since you have had positive tests i would say you are pregnant and should get a blood test taken at the doctors. it is fairly common for false negatives if it's too early to test. the light bleeding could be implantation bleeding. hope this helps.
i had some postive and some negative pregnancy test and now am spotting. can i be pregnant. i took quite a few pregnancy test that came out positive and 3 that were negative. my period was not on time but now i am spotting. the blood is light pink. could i be pregnant or miscarrying