Upset/Disappointed😔

Last past months i have been suppose to get my ultrasound done but everytime i go the lady is not there or they say she got sick and im 8months pregnant and dont know what im having (31w3d).. im jus upset i want to at least see my baby on the picture... and someone else told me the same doc done them the same way until she threatened to changed doctors.. i just dont know what to do... i was planning on doing my babyshower and getting it over with nw since i already brought the building bt this is only pushing me back... any advice... have anyone else been thru this...?