Confused

My cycle is on average 30 days long and I had unprotected sex on the 8 th of October 
​My last period started on the 27th September and lasted for approximately 6 days.
​I have absolutely Idea about whether I'm ovulating or even when I'm fertile 
​The guy I slept with is 17 and I am 18, we are both too young to have a baby and we really need some advice on what to do 
​Please help!!!