It is maybe showing positive because you got previously infected with dengue virus recently
Dengue IgM can come positive after 7days of infection and can be remain positive up to 6months
So if you are having similar symptoms kr not, like you had in dengue infection, once get tested for CBP see your platelet levels, if it is normal, its most likely you due to some other infection, not because of dengue.
Next Steps
For further evaluation treatment and management for your present illness, kindly consult with me now.