Unwanted Pragnency. For this problem.

My name is rohit and my wife name annu age 30 years. My wife feeling like pregnant because she had no period. Last time period at 4th april only for one day but till now no periode. Due to failure of ballon we have doubted about it. and around 40 days has completed and in 23rd march last 3rd day she take UW-72 pill and after taking this pill. Periode in 4 th April for only 1 day. And from 4th april to till day no periode. Now my wife in tension due to this. And she has symptoms of pregnancy like, heavyness in stomach, vomet feeling, no interest in food, Fatigue. and today in morning she vomet of water only and some weight gain also. please suggest the way to stop such pregnancy. We have already a small child and no plan of 2nd. Please help for this problem.