The top test is from today, the bottom two from couple of days ago. According to glow I was suppose to ovulate on 9/24/17, but then the test lines were light but today the line is darker. I am using the Dollar store ones by the way, but the lines show a difference. Does that mean I might be ovulating kater than <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> is showing?