Twinges and ovulation?

well i'm very jumpy with my pms it can range anywhere between the 28 days to 36 so its a tad frustrating. So anyways if i calculated everything right i think i ovulated on the 33 day mark. So i went ahead and bought an ovulation kit and i took it on the 13th. It was negative and i took it again on the 14th it was kinda positive lol i know it wasn't fully positive but getting darker but on the 15th i went out of town to see my sister so i didn't take any test that day but i noticed when i went to the restroom i did have some stretchy CM so my finace' and I have been doing the 'deed' for about 4 days straight. So anyways, we had lastnight but while we were 'busy' my stomach started to cramp like AF was coming but then it stopped. And all day i have had sharp twinging pains in my lower abdomen on the right side i think im done ovulating because my bbs don't hurt anymore like they did on the 14th and 15th. I'm just wondering what are these crazy twinges i have been feeling allday?