I was in a different position than you are so I just told them. I was 29 and told them right away. I am assuming by your post that this pregnancy was not planned?
You have to just tell them. I think you need to just sit down with them and have an adult conversation.
Just tell them, explain how you feel about it and what you would like the future to be like! Also don't get angry or upset with their reactions, it might just take some time for them to get over the shock!!
When I was 16 I didnt have to tell my mom because she told me that I was pregnant. The only time I had to tell her was with this pregnancy, which she wasnt happy with but Thats probably because Im almost 22 and I'll be giving birth to my 3rd son just a few months before I'm 23
Re: how to tell your parents your pregnant?
You have to just tell them. I think you need to just sit down with them and have an adult conversation.
PS I was 18 when I got KU.
Dr.Bailey from Grey's Anatomy