Don’t stress yourself about this, think about your baby’s health. Boy or girl, it doesn’t matter, you will love him/her just the same. As one member mentioned, the egg doesn’t dictate the gender, the speed does, so this is not really in your hands.
As for your in-laws, simply ignore their opinion. It doesn’t matter. They are going to raise your kids, you will. So whether you have a boy or a girl, unless you are happy with the result nobody’s opinion matters.
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