ovulation testing... help 😫

mama-m
So I would like some input. Just some info... This is currently my 5th month TTC baby #1.  For the first 3 cycles all I did was track with Glow. All my cycles have been 31 days. So last month was my first month using OPKs. I tested on CD 13 got a negative and on CD 14 or 15 I got my positive OPK
Well this month I tested on CD 10 and it was negative. So I didn't test the next day, but I did test on CD 12 and 13. But the test line is getting lighter! It looks like I missed ovulation!!! Is it possible that the line will get darker or could I have seriously missed ovulation?? If I missed it, it was too soon!