Pregnant at 16?!😰

Me and my boyfriend are both 16 years old.  We've never had protected sex which is stupid I know.  I had a baby scare last month but it was all good, the test was negative:) and my period was just for two days and very light.  While I was ovulating, we had unprotected sex over 10 times.  I didn't realise that it was my fertile week... Its been 18 days since the last day of my fertile window and I'm 4 days late for my period... Is this just another baby scare or could I actually be pregnant?  I feel sick sometimes, super hungry and always tired...