Detecting twin pregnancies

Patient : My sister is 8-9 weeks pregnant and says she's expecting twins, how early can you tell if someone is having twins?
Doctor :   You can rule out twin pregnancies as early as 5-6 weeks with an experienced physician. Most commonly during 15- 20 weeks a best view of the gestational sac and also the sex of the babies can be known. I would suggest you to wait until 15 weeks of pregnancy to rule out a possible twin pregnancy.    

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