1st trimester scan

Jenn • I'm 33 and currently pregnant with our first baby! Found out on June 8th we are expecting a BABY GIRL! Super excited!!
Does anyone knows what is the scan for? My doctor explained it so quickly yesterday. I asked her what would she recommend but it was a yes or no answer more of an explanation answer. Did any of you ladies have first trimester scan? If so, what did they do?