Hi @Swati Pathak
welcome to Q&A Forum
Certification issues are not covered in this forum, you can refer to this link for support.
https://trainingsupport.microsoft.com/en-us
However I recommend you to enter your mcp dashboard to check the status of the exam reservation, you should have all the exams reserved. Also check for spam and if you entered your email correctly
link to MCP dashboard
https://mcp.microsoft.com/Home.html
Hope this helps
Cheers
Luca