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Since you are 11 weeks andit would be too early to tell the sex unless you had an amnio, I am guessing that you believe your twins are fraternal because they are in seperate sacs? Did you know that only 1/3 of identical twins share a sac. The earlier an egg splits, the less they share. The later an egg splits, the more the twins share so in worst cases you get conjoined twins. So, unless you know the sex of your twins, you could very well be having identical twins and not fraternal.

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