TTC advice

Hey ladies :), im 17 and my bf is 19 and he is on a missiom trip in Russia right now 😩. Him and I were talking about having a baby when he gets back, he really wants a baby as do I. The only thing that is scaring us is telling my parents because my parents have told me before " No babies until your a little older" well what they don't know is that I've been wanting a baby since I was 14. They don't know that im having sex or anything. Whats the best way to tell them without them freaking out? Thank you.