My period is 5 days late and I am worried I might be pregnant. I had my wisdom teeth pulled out three weeks ago, so I barely ate, lost a few pounds and didn't move around at all for 4 days. I was also on a lot of advil and tylenols and general anesthetics for the procedure. Also, my last period was 13 days early. I have also been stressed for school. Are any of these reasons possible reasons as to why my period is late?