how to tell mom I'm pregnant

I am 16 and I am about 15 weeks pregnant.and I haven't gone to the doctor yet but I have had multiple positive tests. my boyfriend and the father is 25, I know my parents will be mad about his age. but we really love each other and I want to spend the rest of my life with him. we plan on getting married soon and want to move in together. how do I tell my mom and dad that I'm pregnant. they are divorced and they don't live together. who should I tell first? should I tell them with my boyfriend? they don't know about him