it's possible since you've had unprotected sex. The only way to tell is to take a test when your AF is due or when it becomes late. I have a journal that I posted with all these sorts of symptoms which all turned into AF :(
But, good luck with everything.
could it not be AF coming early? if your worried maybe you should take a test just to put your mind at ease,sometimes spotting can be implantation bleeding which happens 6-12days after conception.