If you ever did a class-2 medical with a DGCA approved doc.
Then DGCA would've sent you a small piece of paper with a file number and your date of medical on it. You can also get it from the doc who did it for you.
It could even take more than 3 months if you're planning to do your Cl-1 from any of the Air Force Medical centers. But if you go to private one's like Nannavathi,BOM Max,DEL or Apollo,MAA you could get a faster date.
KJ