The recommendations are given by an expert panel after considering scientific evidence from different countries. Please don't feel it as a vail for vaccine shortage. Increasing the gap from 6-8 to 12-16 weeks now (for Covishield only) will increase the amount of antibody formation and hence protection.
Next Steps
Defer your vaccination to 12-16 weeks.
Health Tips
In the meanwhile wear mask, follow social distancing, hand washing, stay at home.