ovarian cyst transvaginal sonogram?

Hi guys! So in December i found out i had a cyst on my right ovary about 4 cm big, my dr set me up a sonogram for 3 months later to see if it grew any. Well I have the sonogram tomorrow morning and it’s a transvaginal one, this will be my very first ever. I’m so nervous!! What should i expect? Can the sonographer tell me anything??? i have appt on the 30th to go over the results w my OB. Any information or stories would help!!!