I've never used OPK's before but decided to try them out. My DH and I aren't planning to start trying until October but I wanted to get a feel of it now. According to Glow and Ovia I ovulated on 8/25, I took an OPK today 8/27, and the test line is not as dark as the control line, so it's clearly negative. Here's my question: is it possible to get two lines after you were predicted to ovulate? Should I take another one tomorrow and see if both apps were wrong? What do you ladies think? I'm including a picture of the test, TIA.