Pregnancy Scare & Telling Boyfriends Parents

Hello Everyone .... I'm 16 years old. And I think I'm pregnant. Me and my boyfriend use protection and I'm not on birth control. But sometimes accidents happen. And I was spotting around the time my period was suppose to come. I told my mom and she said if I am, she'd never force me to have an abortion. She told me it would be me and my boyfriends decision. He's 17 about to be 18 but we're still young. My boyfriend is excited and never wants to have an abortion but his parents are the only problem. If I am pregnant I don't know how they'd react because his brother's girlfriend is already having one and she's older than me. I'm just really scared and stressed out because I want to keep it if I am, but I don't want his parents to hate me.