Does it look like I ovulated yesterday?

[Cori]

I got a faint line on an OPK between Sunday night and Monday 11.30pm. When I say faint line, I mean darker than barely visible. It was noticable, but I would say nearly as dark as the control line. It usually gets darker after I've had a faint line, but I've had no line at all since then. The next one I did was Tuesday 12.30pm and there was no line at all. Could I have missed the positive one in the 13 hours between Monday 11.30pm and Tuesday 12.30pm? What do you think looking at my chart?