If i change drs just so i can get a sono would they know iff i already had 1?

i had a sono at 15w 2d and the dr was lazy to even try to figure the sex ..so now i have to wait almost 2 more months just for another 1 and im impatient this is my first pregnancy and ive been extremely depressed cuz dont know the sex plz no rude comments im very emotional, just want to know if the other drs at a different clinic will be able to tell or not