Do you think i ovulated yet?

Hi girls. I need some advice on ovulation. I had EWCM (lots of it) 24th may, my cervix was high soft and open and stayed like that untill this morning - low, firm and closed. I had EWCM again on 26th May and since the 24th had lower back pain and a dull ache in ovaries. Last night i felt a twinge in my left. Is it possible that my OPK missed the surge and that i ovulated last night? But my OPK today is a bit darker. I'm confused.Thanks =) xx