Positive...I think

In my previous post I told you how I bought some pregnancy tests from Amazon. I used them to test at day 10 and 11 and wasn't getting the results that I wanted (yes, I know that was really early). I did a little reserach and found that First Response was shown to pick up the lowest amount of HCG. I ran out and bought a box of 2. I used the first test with my FMU on DPO 12. I dipped it and waited. There was something faint that showed up, but DH and I weren't certain that it wasn't an evaporation line. I used the second test the next morning. Again, the same faint line. Yesterday I ran out and picked up another box of First Response tests, a box of 3 this time. I tested again this morning (14 DPO) with my FMU and got the same faint line. Still unconvinced that the faint lines we were seeing were positives and not evaporation lines, DH and I did an experiment of our own (a la Bibliosaur). DH peed on one of the 2 remaining tests so that we could see if he got the "evaporation line" too. Guess what? No evaporation line, absolutely nothing, nada. I think that means they're positive. I still have one more test to use. If I can hold out I may wait a couple days to use it and see if I can get a darker line. What do you all think?