I can always tell when I'm ovulating because I have a terrible sharp pain in my abdomen. It's worse when I ovulate from the right ovary, but I also can also feel it on the left, it's just not as bad. It lasts about a half a day and then it's gone. 3 Motrin usually take the edge off for me, but it comes on quick and it takes a while for those pills to kick in so I know what you mean about the pain. I've not yet had mine checked out. I'm afraid it's PCOS (polycystic ovarian syndrome sp?), but I don't know for sure of course.
I had a friend many years ago who always had pain when she ovulated, but particularly when it was on the right side, and the doctors could never find anything wrong with her.
Try not to worry too much until you know something for sure. It could turn out to be nothing. Good luck!