Hi,
    I understand your concern.
    If your wife has a confirmed 
pregnancy.. & you are not prepared for pregnancy, I would request to give a second thought. For if you intend to have a child, why not this one ? medical termination of pregnancy can be done by medicine .. The procedure though looks simple can have side effects ( if not taken care of in time )which are not desirable.
    Any way, if both of you are firm on stopping the pregnancy you can use 
MTP kit . It terminates pregnancy upto 63 days. 
     Kit contains two type of pills  -
       - 1 pill of Mifepristin 200 mg  & 
       -4 pills of 
Misoprostol 200mcg each.
    Single pill of Mifepristin is to be taken orally .After 2 days  it is followed by  4 pills of Misoprostol vaginally.  
Abortion usually follows in 4 hours of Misoprostol. If not additional dose of Misoprostol can be given orally or vaginally.
    * I would 
stress to get the MTP done under a gynecologist's guidance.. to avoid any untoward problems. Like ectopic pregnancy/ excessive bleeding/ incomplete abortion/ infection .
   Thanks.