16 wekeks gender

Ka

tomorrow i go in for a appointment with my obgyn and i’ll be 16+2 and i was wondering can i find out the gender through the regular ultra sound or will i have to get a special one (this will be my first ultra sound) and i was also wondering can my obgyn say she doesn’t want to check the gender or if i ask she has to(my main question) thanks ladies! and did any of you find out the gender at 16 weeks!?