Am i small for having twins?

So my mom doesn't know yet that im having twins and she keeps telling me im small for being pregnant with "one" baby. I went to my doctor's appointment and they said i've only gained 10 pounds and this is my third pregnancy so they want me to gain about 40 pounds at least 😳😳😳 I'm currently 20 weeks and i eat regularly. So am i small for having twins?

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