I've had with my boyfriend.missed perd.bit of bleedin after abt 15 days.wil be taking pregnancy test soon

Bt can anyone pls suggest what to do if it comes +ve.I cnt tel this at home as im only 16 and it would be traumatic if my parents come to know about it. pleeeease i need some urgent help (had on 3rd dec) (bleedin on 18th dec) (perd due on 16th dec)