Those pregnant with twins, what were your first signs / symptoms / clues?

[Sakura]

Ohhh interesting topic!
I have fraternal twin brothers so there is a chance defintely for me... but I'm just ready for one baby - I think 2 would be way too much so I'm praying at my first scan on the 3rd there will only be one healthy baby!

 

[KandKsMama]

Fraternal twins are on the maternal side and always will be due to a woman releasing two eggs and both being fertilized. Identical twins like said before can happen to anyone because it occurs when the fertilized egg splits.

Fraternal twins come from the fertilization of two different eggs, whether it happens in the lab, as with in vitro fertilization, or spontaneously during a double ovulation (1 in 80-90 pregnancies).
Identical twins(and triplets!) come from the splitting of only one fertilized egg. These twins are called identical because, of course, they will have the same identical DNA (genes). Fraternal twins will look similar, but like brothers. Identical twins usually look very much alike.

Above taken from https://www.gynob.com/fratidentwins.htm
Also those looking for twins I know there are ways to increase the chances which I found when looking into breastfeeding increasing the chance of twins 9 times more.
https://multiples.about.com/od/funfacts/tp/howtohavetwins.htm