2 Trimester... Week 12 or 13 ? :)

[scandicmum85]

Maybe silly question but I am not sure if second trimester is when you are week 12 or 13, some places I read its when you 12 + 1 ? x

 

[abbiecourt]

mine says on my tag thing x

 

[XHopefulX]

I've always thought it was 13 but could be wrong x