Faint line/evap at 13 dpo after miscarriage

Hey gals,m 34 ,ttc#1 ,on thyroid meds , had 1 miscarriage at 7 weeks 2 month back , had my first cycle ,m 13 dpo and noticed a faint line today FMU ,the problem is i didnt expect to see anything so i took the test and went to kitchen ,i was not more than 10-15 min gone,(9-15min) ,i see a line ,since i was not expecting anything frankly bcz i m still coping up with our loss , i discarded my urine as well...now m panicking ....plz help..btw i will buy another test and take at night or tomorow fmu aswell..need a reassurance or something or anything!!! Plz reply