[Ambedo.]

No matter how regular your cycle, every once in a while your body might decide to change things up. As you mentioned, there are a number of reasons that your period might be delayed. Beyond what you already mentioned, have there any been any major lifestyle changes that have occurred within the last few weeks? Sometimes the things that we don't really take into account can have a major impact, simply because of the shift that it causes for the systems of your body.

As Jenna said, going to the doctor might not be a bad idea. While it's likely that your period is just delayed for one reason or another, the fact that you've been experiencing uncomfortable symptoms for about a week without any sign of the start of your cycle means it doesn't hurt to get checked out, just to make sure everything is alright.