If i am not registered in first round counselling then i will eligible for registered in secind round or not ??

Hey Anchal,
Yes you are eligible for second round directly as according to the rules setup by Medical Counselling Committee (MCC) which says that if you have missed the first registration than you can directly go for registration in second round of counselling. It is clearly mentioned in the FAQs ( Q.no. 14... Please Note...) given on the official website of MCC.
The fresh registrations for second round would be available before second round counselling, visit the website regularly to check out for registrations.
Link for the FAQS is here given below, you can check this out for complete confirmation : https://medicalcounseling.nic.in/UGCounselling/Documents/FAQMCCUG2019.pdf
Feel free to ask any other doubt!
Good Luck!