Hi there. Thank you for your question. I will be helping you out with your queries
The thing is that Flu vaccine helps prevent influenza infections but it does not provide one hundred percent protection and the symptoms that you are mentioning can happen due to many other viruses as well so it may not be an influenza infection.
1 day prior to becoming sick and for 5 days after they first develop symptoms is the contagious period.
So you are most likely not infectious or contagious now.
Let me know if you have any further questions.
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