Chest pain during pregnancy

I’ve been waking up with chest pain and I don’t know if it’s because my boobs are growing or something more serious. Called my doctor to make an appointment but was told there was nothing available until two weeks from now. So I was told to go to the ER so I can get the chest pain checked out, nurse on the phone said I might be dehydrated cause of throwing up and may cause chest pain? Idk if to go to the ER and check out why I’ve been having chest pain or just wait till my next appointment on the 27th. Any advice on what to do or experiences with chest pain? Oh and I do t have severe heavy breathing but i just noticed that i do take deeper breaths.