faint lines? please help!

Hi! I'm due to start my period today and I've had brown discharge since yesterday. My breast are only a little sore. It feels like my period is going to start but I see faint lines on my tests! We have been trying to conceive for 1&1/2 years with 2 early miscarriages. Do you think it could be a fasle positive due to blood being in my urine? Any advice or if you've had this happen before please help!