Had 5 days before my period, period was on time, was shorter and lighter than normal, pregnant?

It could be stress... sounds like you are stressing out, and you might have been stressing during your period too. That could mess up any period whether or not if it has always been regular. It is too early to tell, I would wait until your next period, and if that does not come then take a test. But you could always but a two pack test and take one and save the other one.