I did ligation 2 months ago, had taken contraceptive pills for 2 year and stopped for 1.5month but my period never come. Test for prenancy negative.?

Could be normal. It is not too unusual for the return of normal periods to be delayed after stopping birth control pills. Almost always the period recurs by 3 months. Most important is making certain you are not pregnant and it is also important to consider being medically evaluated if other symptoms like pain arise.