Faint positive or evaporation line?

My husband and I are TTC our first child. I have been off BC (skyla IUD) since the first of January and had a somewhat irregular cycle since (two periods, last was 14-18Feb). I have been using OPKs, which this past cycle showed two surges (last was 17Mar). We had intercourse around both LH surges. I have taken HCG tests the past two days, which show a faint line. Yesterday’s test is on top with today’s on bottom. Is this a positive or evaporation line? Only possible signs of pregnancy have been some very mild food aversions and breast tenderness that begun a day or so ago. Any insight is helpful!