How do I tell him... HELP

I'm taking a pregnancy test on Saturday I had unprotected sex and he came in me 4 times. A few days after that I got the implant rod in my arm. Since then I had one day where I had super super light almost pink blood and I haven't had a period since. I've missed one period almost two now. I'm only 15 and I don't know how to tell him if the test is positive. I don't want to be left alone caring for a baby by myself. I'm 100% not getting an abortion if I am pregnant. I just don't know how I'll tell him he's 16 almost 17 and he says a baby right now would ruin his life. If it comes up positive should I tell him right away? Or figure things out first?