Friend is pregnant guess the sex

Erin • In love with the most amazing man in the world 10.20.12 ❤️
She is 9 weeks along so obviously it's too early to tell but the heart beats per minute were 171 and an old wives tale is that if it's over 160 is usually a girl and we did a test where you mix her pee with baking soda and if it fizzed it's a boy and if it did nothing it's a girl and when we mixed it it did not fizz meaning it's a girl any other wives tales you know of that we could try please let us know 

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