This better be an evap line...

My first just turned 2 and my baby is 3 months old. I have literally only had sex twice since she was born, but we had a condom fail one of those times. It's time for my period to start but nothing is happening so I took the only tests they had, which are blue dye (I know, i know). A very faint line appears right after the test window, but it is darker today than it was yesterday. The same thing happened with my baby. Now I'm waiting on my two year old to wake up from his nap so I can get more tests. Talk me down, what are the chances I'm not pregnant... like 80%? 50/50?