pregnant the hyperactive thyriod

im 20 years old and i have a child that is 19 months old. march 1 2011 i started spotting dark brown no red whatsoever it was not constant and it lasted for four days. for the past three days i have had tender breast and since i have a child i cant tell if they have gotten darker, since they were already dark to begin with. i have a discharge that is more than usual with out a smell. i have lost alot of weight due to hyperactive thyroid i shot down to a size 1 but i am now a size 3. my appetite has increased. im wondering if im pregnant or all these symptoms have to do with the hyperactive thyriod. 10 months ago i didnt have a period due to a cyst on my overy i did not have one for 6 months i went to the doctor and they put me on birth control and somewhat regulated my period i dont know if im going that direction again or whats wrong with my body. i did a home pregnancy test and it came out nagative today is it too soon te check to see if it is a pregnancy? i also go to sleep early but find it very hard to wake up early. sleep more than 8 hours a nigt this has been going on for the pas four to five days