hi and welcome to HCM,
post extraction is a rare condition unless the extraction of wisdom tooth is traumatic .
Numb sensation in the tongue or parasthesia is caused due to damage of lingual nerve
due to traumatic removal of the tooth.
In your case i suspect , damage to the peripheral nerve
branches during extraction may have developed this loss of sensation which is temporary.
Nothing to worry about as these nerve fibres regenerate with time so you can wait for another week or two, if the symptoms persists after that please consult your dentist
i hope i answered your query,
get well soon.