Okay so I recently

Found out I was pregnant and I'm about 5 weeks along. I need help... I need to tell my family but I don't know how to... my mom and brother wanted me to wait till a after college but it happened sooner then my boyfriend and I expected. My brother practically told me months ago that if I was to get pregnant he would disown me and I'll never see my niece again.... and My mom said she'll be extremely disappointed and let me know it throughout the whole pregnancy... I'm scared to tell them, and I'm stressing.... I'm stressing so much I'm afraid I'll miscarry.... any advice?... no hateful comments please...