After the 1st round of seat allotment, if you dont get any of the seats then you will be asked for online choice modification in 2nd round and 2nd round allotment will happen  ,your admission won't be canceled , same process will be continued for round 3 and after that admission's will be closed,also after 1st round allotment happens keep a tab on each and every update from their official website:

Here are few brief snippets which i took from NCHM counselling official source to clear your doubt futher

• Online Registration is mandatory for all eligible candidates to be considered for seat allotment in the 1st and 2nd round of Counselling. Eligible candidate are required to register ONLINE through Internet (http://www.nchmcounslling.nic.in) from places convenient to them during the specified period. The procedure to be followed is described here.  Access the website www.nchmcounslling.nic.in and click on online Registration and choice filling.
• On the basis of choices submitted seats would be alloted for the first round, seat allotment will be done for the 1st round, candidates who have been alloted seats for the first round would have to report at the center for seat confirmation and document verification for 1st round
• After this 2nd round of counselling will start in which:No fresh registrations would be allowed in the 2nd round of Counselling. Only the Candidates who have registered in the 1st round will be eligible in this round of counselling.
• Though candidates whose seats got cancelled in 1st round , those who got seat but want to sit for 2nd round two etc etc apply for 2nd round . For registered candidates who are not allotted any seat in the first round of seat allotment. These candidates are permitted to change their earlier submitted choices through internet. If candidates not submitting fresh choices in this round then, their choices submitted during the first round of counselling would be considered for seat allotment, for second round  .
• Though i have mentioned counselling criteria above i am attaching offical NCHM counselling process pdf taken from their official website for furthur reference and help https://nchmcounselling.nic.in/nchminfo/Handler/FileHandler.ashx?i=File&ii=84&iii=Y

Hope this helps.

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