Just wondering

Katie

My husband and I are ttc and I've been <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>, according to this app my peak time will be Sunday. I've been having a second(faint) line show up on the ovulation test for the past 3 days. This morning it was slightly darker, so I just tested again, and it was the lightest it has been so far:( is this normal??