When do you think I Ovulated?

RM 💕

I don’t temp, unfortunately.

Having trouble determining when I possibly ovulated.

I thought I got a positive OPK on the 9th:

My OPKs continued like this that evening and on the 10th. On the 11th I got this OPK with a much darker line:

So I kind of just assumed I ovulated on the 12th. Would my assumption be correct? I took another OPK on the 12th and the lines were still dark but not as dark as the above pic.