This morning I took a first response pregnancy test. After the three minutes I looked at it and there's a faint line! We've been trying for two years. Was only able to get pregnant once but it ended in a miscarriage last month, so I'm kinda in shock. I immediately get another test (different brand) but this one looks negative to me. Not sure if I should test again. Period is supposed to start today. Nothing yet! Why would one look positive and one negative?