If you are only a few days late, I doubt that you would already be having symptoms of pregnancy. I found out I was pregnant, 4 days after my missed period by testing. I didn't start having any real symptoms until about week 6. Then the morning sickness and fatigue set in.
There are a lot of women that "have the feeling" that they are pregnant. You could very well be pregnant, especially if you had unprotected sex around the time of your ovulation. But again, the only to know for sure at this point, would be to take a test.