CM & O p[ains varied for me!
I never really noticed my CM before before looking into TTC & O signs then it was like WOHHHHHH
CM can vary I didn't get loads but I'd have a few bathroom trips where it was obvious when I started checking. If you don't have much CM there is a medicine that can help increase it whicg Arcanegirl (or others?) may be able to give you a bit of info on (I never did it).
O pain I didn't always get it I think I may have experienced it a couple of times but not every month although CM & chart told me I was defo ovulating so it wasn't a concern and pain wiseit was mild & tight I think not overly OUCH!