7 weeks - very little symptoms

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At our 6 week US, we found out we are having twins, but I have barely experienced many symptoms. I have had very minimal nausea, around 5 weeks I was extremely tired, my boobs are sort of tender, and I have absolutely no appetite, I've actually lost 5 lbs. I've read that many people have this experience with a singleton, but I'm so nervous that I have barely any symptoms with twins. Anyone else have minimal symptoms with twins?