Hello, you must be feeling so nervous right now. There isn't anything you can do at the moment, however. You can take a pregnancy test about 14 days after ovulation, which will be about 28 days after the first day of your period...meaning just at the time you would get your period next. If you miss your period, then take a pregnancy test. You can obtain one at your local drug store or grocery store. They are cheaper at the dollar store and work just as well. You could also make an appointment at your doctor's office without your parents' knowing; however it is best to tell them or an adult you trust. Also note that women can have similar symptoms to you during this stage of their cycles on occasion; (it has happened to many of my friends and even me). Try not to think about every possibility right now. Get rest and take vitamins; if you are pregnant, folic acid will help the developing baby.
I hope this helps a little. But please talk with a grown-up whom you trust--that will calm you the most.