Evap line?

Hi I took a pregnancy test late last night and I thought I could see a 2nd line appear within the test time but I thought my eyes were playing tricks on me so went to sleep and looked at it this morning and low and behold there was a 2nd faint pink line. I am however on the pill and know its hard to get pregnant when taking it correctly which I do. Ialso did some research and found out about evap lines too. I also know that taking a test later in the day can bring up a "positive" result because the urine is highly concentrated from drinking fluids.  I did a test this morning which I'm pretty certain is negative. I've ordered some more digital tests just to be sure. Please can somebody confirm this is an evap line. Thanks. top image is the test from last night and bottom one is the test from this morning.