Late period flu?

Tiffany

So I’m 3 days late today and normally I’m not late I’m always on point with my period date. Last night and for the past few nights I’ve been feeling nauseous & had diarrhea. Last night I woke up to vomiting so much and continuous diarrhea so I took myself to the hospital & I had told them the situation and that I wasn’t sure if I had the flu or if I was pregnant seeing as I was late for my period . So they do act scan a urine sample and blood test for the flu and pregnancy & said I have gastroenteritis & that the pregnancy came back negative . I’m so frustrated bc I have a huge feeling in pregnant I’ve been getting all of the symptoms :( had this happened to Anyone else and found out later they were pregnant ??