Congrats sa baby mo! Honestly, week 12 is perfect para sa dating scan (yung anatomy screening) kaya go lang, walang problema yan, one ultrasound per trimester is totally safe at normal naman. Since ang next check-up mo ay week 15 anyway, pwede mo i-combine yung ultrasound week 12 then just bloodwork or regular check lang sa week 15, pero syempre best na i-discuss mo din sa doc mo kung ano talaga ang plan para sure, lalo na kung may specific concerns sila based sa TVS results mo. Excited na excited ka talaga, nakikita ko haha!