A few decades ago, women didn't know if they had twins or normal pregnancies until they went into labour.
However, due to the modern technology, such long term surprises are no longer a problem.
Thus, most of the pregnant women find out if they are facing a multiple pregnancy or not the very first time they go for an ultrasound check, which is during the first trimester of pregnancy.
In fact, the doctor usually sends you to be checked if you gain too many kilograms during the first trimester or pregnancy.
This doesn't necessarily mean that you have twins as it may also mean that your doctor didn't calculate the dates properly.
Therefore, this check is very relevant if you want to know whether you have twins or not.
If you get pregnant after a fertility treatment, you will be probably be checked during the first eight weeks of pregnancy so that the doctors can figure out how many embryos you have in there.
Generally, the ultrasound is ninety-nine per cent accurate when it comes to discovering multiple pregnancies, especially if you are in your sixth or eighth week of pregnancy.
However, the more kids you have, the easier it is to miss one.
The non-identical twins develop from two ovules which are released and fertilized at the same time.
On the other hand, the identical twins come from the same ovule.
Your twins may be identical, but their resemblances stop at a certain point because no one is just like another person.
The thing is that it is very difficult for someone to track those differences, even if we are referring to the twins' parents.