day 3 pregnancy challenge how did I find out

I found out because the week before I tooktl the test I was really highstreung and moody all the time I would go from happy to sad in a matter of seconds. I went to my psychatrist and he thought I was my bipolar acting up I was off my meds cause we were trying to get pregnant. I told my hubby what he said om u can go on ur meds if u take a pregnancy test and fail. sure enough I took it and it was positive.