How to tell my parents I’m pregnant

I’m 18. my parents have NEVER talked to me about sex. I have a 6 year old sister but im basically the baby in the family. so my parents think I’m very innocent &haven;’t done anything bad. I just need advice on telling my parents I’m pregnant. my boyfriend of 8 months already told his family and they were very understanding but my parents are extremely strict & I feel as if it will ruin a lot of things between my family. I’m really dependent on them as well due to how they raised me but please give me advice & tips. thank you!