I had sex on Aug. 5th and we used protection of course. I noticed the next day I had came on my period which is around the time I shouldve. Now the period was shorter than usual and lighter than it usually is... is that a sign of pregnancy or anything? Never happened before. I'm stressed out, PLEASE help!

? Why of course ? Many do not use protection,

But yes a light period right after sex is a sign. But of course it is a sign for a dozen other things. So it means nothing.

There is nothing you casn do at this point, except wait, you will have to wait till next month and see if that period comes.