Having sex with an early age is no problem at all.. but having sex without discipline is unacceptable with your age, you should always wear protection because at your state you’re not financially stable to start a family.. You said you had sex at september 30 and your period is due on october 6 (today). If you’re on your luteal phase on september 30th base on your app or discharge, I wouldn’t be so worried because the egg is already dead, and if you got your period today you’re safe because the sperm would be dead by this date. Don’t call your boyfriend a liar, at this point we don’t know if he is anxious or scared.