Chromosome testing/Gender Reveal

Magen • Married 💒 💍 Endometriosis- First baby girl 👶 - due Nov 20, 2019- 🤱🏻Trying since June 2018

My test Came back Negative AND My 🌈 baby is a girl!!!!🥳🥰

Also, its say 12 weeks 6 days is 2nd trimester... 🤔 is that correct? I thought it was 14weeks...before 2nd trimester?