Opk testing

I have been testing for ovulation this month. We went out of town and I did not test on Sunday. I tested this evening and I have a 2nd line but it is not as dark as the control line. I should be ovulating anytime now or over this past weekend based on glows predictions. But my cycle is not regular since being off bc for the past 13 months! Last month was the first month glow got my period right.