Great Potty Shot! Yet still confused

had this sono 2 weeks ago at 13 weeks 3 days which is early to determine gender. The tech said boy, but friends have said its def a girl ( 3 clear lines). My mother is SO excited and buying baby boy things right and left, she always wanted a boy but had 3 girls lol- I keep telling her to keep receipts!
 What do you all think?

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