Ultrasound now hospital

So im freaking out a little today was my 19wks ultrasound and everything seemed really good the baby was moving around alot we got to find out that we are having a girl and we are so excited but on the way home the imaging place called and told me that there doctor has called the hospital and that im to go into tomorrow and see this doctor and thats all they said they said which ward to go to but they didnt tell me anything more than that and im kinda freaking out i had my next appointment at the hospital for wednesday and it seems important if they are getting me to go in tomorrow but cant be really bad or they would get me to go in tonight so i dont know im just getting really worried