Symptoms tell nothing, so you really can't rely on them for determining pregnancy. When you say you had sex, that was very close to your period ending, although sperm can live up to 5-7 days in there so it's possible if you ovulate early. All you can do is is wait and see if your next period is late, and if so take a test with first morning urine.
it sounds like it but u have to take a pregnancy test first...u should take one a day or two after your expected period which should be on the 9th of may and test with your first morning urine