This is too impossible for me to be pregnant.?

If you had unprotected sex, then yes, you could be pregnant. Whenever you have unprotected sex there is a possibility. If you had unprotected sex on June 16, it would only be 10 days past the actual intercourse. It can take 5-7 days for a fertilized egg to implant in the uterus, which means if you were pregnant, you would only be about 5 or 6 days pregnant. There is no way that a home pregnancy test would be able to tell you that early. I would wait at least another 10 days and test again. If it comes out negative that time, wait until you miss your period. Your next period(if you are regular) should come in early to mid July. If you think you are still pregnant and keep getting negatives on home pregnancy tests, you can go to your doctor and ask for a blood test, or you can visit your local health department and they will more than likely test you for free.(It depends on how much income you have.) Good luck!