First ultrasound

When did you get your first ultrasound? Was it done abdominally or vaginally? What should i expect during the first ultrasound? At what point should i get one?
​Im not even sure how far along i am in my pregnancy..based on online due date calculators im abt 6 weeks. Would really appreciate some insight, im feeli quite overwhelmed. Especially bcause im in a country that has horrible healthcare and i dont really know how their health system works. Just want to get my ultrasound done at the right time.