disappointed

so I just found out i’m pregnant. i’m 15. my family planned a vacation that they had already paid for in june and i would be pretty pregnant by then and i’m so scared to tell them because all that money will be wasted. they spent thousands of dollars. my whole family did. and it’s a vacation that they can’t go on without me. how do i tell them? my family is middle class so not poor and not wealthy but i just feel so bad. i used a condom with my boyfriend but it broke. i have straight A’s and B’s and i’m in advanced classes I have no idea what to do. I know people post stuff like this all the time but i feel my situation is different because my parents wasted all this money and it’s my fault. i don’t know what to do. advice?