Hello. I'm 15 years old. My average cycle length is 28 days. My past period was on September 7th. My fertile window was from September 17th to the 22nd. I had unprotected sex with my boyfriend on the 21st (my most fertile day). My next period is due today, and it always comes in the morning, but it hasn't come yet. My boyfriend and I can "feel an energy". I know it sounds crazy. I'm not experiencing any PMS, but I'm experiencing a lot of pregnancy symptoms. I took a test yesterday and it was negative. So am I pregnant? Please help.