Should I tell her?

af is due tomorrow and it's 11pm now. I have no signs of her showing and I'm nauseous. 13 dpo. I took a test today but didn't use fmu and got a negative. I'm only 16 but my sister is 27. Should I tell her so she can get me a test and I can test tomorrow with fmu? Please help! Im hesitant to tell her because I don't want her to tell my mom or any family members.

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