To those young mom in here like me that their parents doesn't know about their situation can you give some idea of how you open that kind of problem into your parents i really need your advice...Please!!!

I just turned 22 last week and my parents were asking me to study hard to earn good grades. They’ve been very keen to me lately since I’m the only kid left in their care, my siblings were already married and have their families of their own. Aside from their advice to do well in school, they always counsel me to never go beyond the limit with my long-term boyfriend. The thing is, I’m 2 months pregnant already and I’m afraid they might sue me for the mistake I did. I’m so sure they’re gonna be so mad with what happened. How do I break the new to my parents?