Omg. Help. *facepalm*

So I need some help. My normal cycle is 30 days exactly. I'm on cycle day 27 now. My boyfriend and I had sex on cycle day 14. We used a condom and he pulled out, but I'm kind of nauseated and have a metallic taste in my mouth. I haven't taken a pg test, but still wondering if it's even possible for me to get pregnant. I'm totally embarrassed to even ask, but I just want to know if it's a possibility, or can I chalk up the symptoms to something else?