help! Does cramping mean ovulating?

this is my second cycle of using opks since coming off birth control and I need a little help. I got a positive opk yesterday and then today I am experiencing cramps and discomfort on my right side. I tested again a couple times today and both have been dark but not quite positive. I know that when you get a positive that means you should ovulate within the next 12 to 24 (36?) hours. so does that mean I'm ovulating today and that's why I'm cramping? I never got cramping with ovulation before starting birth control so I'm a little frazzled.