Help please

So idk how to tell my mother that i am pregnant. Im 17 about to turn 18 and get out of highschool. Literally in like two months. And i want to wait until after graduation so she doesnt hate me so much. I mean it was a accident but i still love my child. Im getting into college right after highschool(community college for basics) and im working part time. But will soon will be working full time. I just need help on how to break it to my mother.