It is very important to make sure that you guys are on the same page and want the same thing. It is always a good idea to know how both of you feel about children, jobs, religion etc. These small little things can become big problems later in life. It is important not to catch her completely off guard as a surprise proposal without even discussing marriage at some point can and will almost definitely lead to a very hesitant “yes” or “I will think about it”. Even though you’ve discussed getting married, the marriage proposal itself can and should be special, and a surprise. Girls wants to be wowed.