Stomach bug or pregnant

Ma
So for about 3 days I was completely nauseous so I went to the doctor and they said that I had a stomach bug and that it should go away after 4 days but now I'm on day 7 and I'm still nauseous I've taken 3 pregnancy test and all or negative but I'm having many more symptoms of pregnancy vs stomach bug like I'm sensitive to smells ,my breasts hurt ,I've been peeing more frequently I just don't know what to think has this happened to any of you ladies before?