I read an article yesterday that a much higher percentage of Omicron cases are actually testing negative for vaccinated individuals.....not even going to try to repeat the science for why that is happening....mostly because I do not really remember/fully understand the details. Many cases have only shown those type of symptoms for 24-48 hours for vaccinated people, so I would not be surprised at all if you actually were positive. Based on the wastewater analysis the CDC gas been reviewing in Orange County (Central Florida), it was suggested it would be difficult to throw a rock and not hit someone actually infected with Omicron.