Thanks Navya for your clarification.
It appears that you proceeded via a continuation route in US rather than regular national stage entry. Usually this method is adopted to move back the 102(e) offensive prior art date, besides availing some other flexibilities. [correct me if this is not the case]
Irrespective of the tactical maneuvers used in US, one thing that appears from your statements is you are claiming priority from an Indian patent application. Therefore I can safely assume that the subject matter of your subsequent application is similar to what has been disclosed in your priority application (Indian application, which is still active). If this is the case, going by the plain reading of Sec 8, filing F-3 appears to be necessary.
This does not constitute any legal advice. You may consult a patent attorney with all the facts as you might not like to discuss so explicitly on a public forum.