Last month I had my thyroid checked and it is low. My husband and I were prescribed provera because we are trying to get pregnant at this same doctors visit. I ovulated on the 26-27 of April, had some spotting when I wiped on the 1-2 of May. I am currently breastfeeding my one year old but have had some of the common early pregnancy symptoms. I missed my period three days ago, my breasts feel heavy, I m always tired, a lot of bloating, and some nausea and aversion to smells. However all of the pregnancy tests are negative. Is it possible my low thyroid is making the test show negative? And if so when can I expect for it to show positive if I am pregnant?