What to expect seeing a specialist ? & progesterone shots

Bri

What would I expect at my first specialist visit , I know for sure and ultrasound . but anything else ?

Shot are to prevent pre term .

With the shots my obgyn said she will likely start at 19 weeks , but did you get them weekly or twice a week ? I'm going in to my obgyn clinic ; idk if that will make a diffrence.