I'm 16 years old and I'm concerned I'm with child. My first day of my last period was April 28 and my boyfriend and I had sex May 13 without a condom and he pulled out. I've heard people say pre-*** can't get you pregnant is that true? I've taken two EPT tests which were negative at first but became positive a few minutes after, which could be evaporation lines. I've been having awful back pain, right rib pain, migraines, nausea, and fatigue. What do you girls think?