Hi Bree,
I think there may be a very wide range of 'normal' so while some women may have the typical 28-day cycle, many don't and it's not necessarily a problem. Maybe this is just the way your ovaries work.
I'm pretty sure ovulation pain occurs at ovulation.
Having sex at day 12-14 makes sense if you ovulate on day 14.... but not if you ovulate around day 21 (well, you can still have sex then if you want, but you know what I mean )

Good luck!