How to tell mom?

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I am 20 years old.. So, I work out with a trainer and was trying to lose weight then BOOM 💥 i found out that Im pregnant . But my mom is going to be 43 this Sunday and I don’t know how to tell her. I went to the doctor a blood test today and they said they will let me know tomorrow. I want to know how i can tell my mother im pregnant . She isnt from the states and she is from the caribbean. I am worried that she will jump across the room and kill me when i tell her. I went to workouts for the first time this week since i found out and i was scared because I dont wanna hurt my baby so I had to pretend i was in pain and i told mom that It started happening on Monday (when i found out) & that my period was spotty (which is true) and I was scared cus it never went on to be a period . She asked me if i was still on BCP and i said no I wasn’t . She was a lil mad cus i didnt tell her i got off them and I got off them literally a year ago around this time. She “thinks” it’s an UTI and said i should go to the doctor tomorrow but I already went today. So I don’t know where to go from there.. I wanna tell her because i know i cant continue working out with heavy weights and intervals without being paranoid that i’m gonna hurt my baby. I’m only 4 weeks.. Help me...