Is 2nd trimester week 13 or 14?

[bootyb]

im totally confused.... which jes makes me dumb lol coz my mums a midwife.

 

[Arcanegirl]

Ive been wondering the same.
Though the forum says 14 weeks, i think it starts at 13 weeks

 

[Always&4ever]

13weeks officially

 

[polo_princess]

I think most people make the transition when their 13 + 1/2 etc as your are into your 14th week then, if that makes sense!!