Lelizalde

Hi everyone! I arrived with a K1 visa, I already got married and now im filling the forms for getting the green card. 

I didn´t change my last name (adding my husband´s last name) yet (and I only have 2 weeks left before my visa expires). 

I talked with some people and they told me to fill the forms with the name that I would like to have after changing my name because if I want to do it after the green card is done I will have to pay another $500 for making the last name change in it. And for what I read I cannot change it yet with the SS because my visa expires in 2 weeks. 

What Im worried about is that when we filled the form 129f we did it with my name and now if I fill the i485 with the name i want t have they wont be able to find it. Please help! Has anyone had the same problem?