No stomach visable in 20 week and 22 week scan 😭

Went for my 20 week re-scan today because last week due to her position they couldnt check hear heart or diaphragm. Today at 22 weeks they couldnt see her stomach they said it could be due to it being empty but because it wasnt visable on two seperate occasions so we've been referred to the specialists to go back for an indepth scan. Has this ever happened to anyone else? Im trying not to worry but i just cant stop crying. πŸ˜­πŸ’”