I suggest you have a heart-to-heart talk with your girlfriend before you get married. The purpose is to show that two people have to live a lifetime, and there is no need to spend some unnecessary money before getting married. If you have the support of your girlfriend, you will save a lot of unnecessary expenses!
That's what I did!
If your girlfriend doesn't support you and listen to you, then think about it and wait until you have real strength to get married!