Medically speaking it depends on who you ask (12-14 is the range). If you are referring to BnB they list second tri as starting at 14 weeks. Since I've been on here people move to whatever trimester they like when they want so in that sense I agree with a pp it doesn't really matter. I still visit and post on all forums including ttc so dates of pregnancy really don't set boundries imo
Ill say when the nausea wears off!! LOL