Usually a 7week ultrasound will pick up twins although sometimes its not till later that its picked up. Often with twins you have really bad morning sickness (but not all the time) and you do show earlier or have a larger fundus (top of the uterus) then expected for that gestation.
Twins run in families so if there are twins on your side of the family (faternal) you are more likely to have twins yourself. Also the older you are the more likely you are to have twins and the more pregnancies you have the more likely you are to concieve twins. Of course twins can occur even with no family history and when you young. The chances of twins increases after the age of 35 apparently.


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