How close to my positive opk?

Lizzie • Due in July 2019 with our rainbow after a loss on 6-28-18. Blessed with a 2.5 year old, 7 year old and 13 year old. All boys

How close do you think I am to my positive opk? Last month I ovulated on cd 19 but it was my first month off of my iud so I think it delayed a little. I am cd15 now. May be able to baby dance only once this week so trying to figure out which day would be best. Thank you