Help... ugh

Ok first off I start dating my first really before 2 weeks ago. I'm 14 9th grade. My 20 year old sis is pregnant and my parents been really strict. I want to tell my parents soon about my boyfriend. I made a plan to tell them friday morning before I leave for school. my parents will be away for the weekend. Do you think it's a good plan to tell them before I leave so they can think about it?