Need advice!

Heven
I posted yesterday about my OPKs. I've been testing once a day and since my schedule always varies it's been at different times a day but usually second morning urine or a little after in some cases. Before the 2nd all were VERY light control lines. Then on the 2nd got darker, 3rd even darker and today it actually seems to get a little lighter again. Hopefully I didn't miss it. I rest within my 24hrs. My fertile week is now approaching according to glow so hopefully not. Any insight or experience with this before? If this has happened to you, did you soon after get a positive opk? Any insight would be very appreciated. My husband is military so timing is everything for us these days with crazy schedules. Here are my OPKs in order 2nd,3rd and today.