Me and my boyfriend recently had unprotected sex and I was wondering if I could be pregnant or not. I've been feeling kinda nauseous, I have headaches, a little bit of backaches, my breast have been super sore to the touch and I just feel off. My period doesn't start for two weeks, so I won't know for sure until then but is it possible i could already being showing signs of pregnancy? How soon should I take a test?