I know this is very, VERY weird- but im feelin like Jane the virgin right now

Now stay with me here, I know all about Sex-ED and how you HAVE to have semen enter your vagina and correlate with you eggs, etc, BUT im a virgin and im possibly showing signs of pregnancy. this is so weird and scary for me. Im 15 and my period is late by 3 days. Ive been feeling nauseous for a week and just now I actually got sick and i have a fever. whats wrong with me?? help!!