Hello kaushik228,
Thank you for using Apple Support Communities!
We understand from your post that you would like to remove Cycle Tracking from the Health app on your iPhone. From the Summary page in the Health app on your iPhone tap Edit in the upper right corner. Then tap All on the right side. Scroll down to Cycle Tracking and make sure all the stars on the right side are empty (unselected). Then tap Done.
You can also hide the app from your Apple Watch using the steps under the heading, "How to hide the Cycle Tracking app", that you may find helpful:
Track your period with Cycle Tracking - Apple Support
Best Regards.