(TMI) cycle day 12 first day of sticky cm.

So Im on cycle day 12.I am pretty regular but my last period was 5 days late. I am trying to get a grasp on how long my cycle is. I have had pains in my left ovary and sticky cm today. I think this is the first stages of my fertile window but I'm not sure. I guess my question is has anyone had sticky cm on cd 12. How long is the cycle when this type of cm is on day 12?