My periods are usually regular. recently when we moved, they were thrown off cycly for a few months. now their regular again. should i be worried?

Don't worry: It's hard to say why it happens, but sometimes we aren't exactly regular. Even if it's never happened to you before, it could be happening now. Things like medications, stress, travel, changes in your weight, can all cause a late period. If your pregnancy test is negative, and if no period for a couple of months, i would see your gyn doc. Excessive bleeding is another reason to see the doctor.