I had unprotected sex, he didn't finish , despite that I took an EC about 8 hours later. That was four days ago now, and for the past two days I've been experiencing extreme fatigue. My next period isn't scheduled to come for another 3 or 4 days. Is the fatigue an early symptom of a possible pregnancy? When is the earliest I can take a pregnancy test? How effective is an emergency contraceptive? I'm unnerved by this, mostly because this is my first time taking an emergency contraceptive. Any information to help ease my mind would be greatly appreciated.