Plan B and pains - am I just paranoid?

Sorry if this has already been answered. First of all I did have PROTECTED 4 weeks ago. It was very short but I was worried the condom leaked or something so I took Plan B about 30 hours later just in case. A week later I had a very heavy period that lasted a week. I am having "ovary" pains but I'm not sure when they started. Somehow I got it in my head that the pains mean I am pregnant and I've been worrying the heck out of it. I called the Plan B hotline to ask about side effects but basically all I got out of it was that every woman's body is different. I really think it is highly unlikely that I'm pregnant seeing how we used a condom and how my period was so heavy. Even the idea of taking a pregnancy test freaks me out. I haven't talked to any friends or family about it so I guess I'm looking for advice. I read that it can take time for your periods to be regular again after Plan B so I'm thinking maybe the pains are because I'm getting another one soon. Anyone with experience with Plan B please help. Should I just take a darn test to make sure? Also I am taking bromocriptin to treat a pituitary adenoma if that makes a difference. Thank you