Usualy it's pritty regular though there have a been few times were it's not. I have had my period for 3 now. Just after having my period for a year my period was 2 months late or I guess you could say I missed 2 periods!!! When I first got my period it was every 35 days instead of every 28 days but it slowly worked it's way down to every 28 days! I guess now that I think about it my period os often late by either a few days or a week and once in a blue moon a day or 2 early!!!! I don't usualy feel ovulation though!!!!
Sounds like it may be ovulation. Have you always had regular periods? I don't always feel it, but sometimes it's pretty painful.
I felt the sharp pain earlyer today to just an hour ago when I was having a bath it was like a line of sharp pain what is this???