Teen pregnancy

So I’m 16, I didn’t expect to get pregnant at this age but my pregnancy results are positive and my period is over a week late. I’m more scared to tell my stepdad, my mum already knows and is very supportive however my stepdad is going to freak out. My real dad and stepmother eh they won’t really care they don’t take much part in my life. I’ve already raised my little brother and sister, since their stepmom is a deadbeat. But I’m lucky enough to be able to create a life and I’m going to be a proud mama