Hey George!
As u said that u applied on 18th of March at VFS Ahemedabad.......and the applications submitted in ahmedabad are processed in Delhi so it must have taken two-three business dats to reach CHC in Delhi and then at the month end there were atleast two national holidays for Holi and Good friday so I think u shud still wait for sopme time as it takes approx. 15 working days after receiveng an application for them to respond back.... according to me its been only 7-8 working days since they must have received your application her in delhi and started processing it......
So, I would suggest you to relax my friend and enjoy ur last few days in India....
I wish u good luck and pray for your speedy visa approval
Best Reagrds!
Akshay