I864 Tax question please help!!!

[jhigareda41 30]

I am a DACA beneficiary and have been working lawfully since 2012. My wife and I have been married for 1 year and 8 months now. She is my petitioner and my sponsor and I will be including my income as the intending immigrant to meet the requirement.  We married March of 2016, and only have one year of filing jointly(2016). I have heard that CDJ in Mexico requires 3 years of proof of income. My annual salary for the last 3 years(which is including 2017) are as follows:

My Salary
 2015- $13000 *while in college 
2016- $28,000 
2017-$29,000

My wife last worked March of 2017, and was working part time as a server making roughly $7000 annually before we met and up until she stopped working. This is where I get confused, does the fact that I only made $13000 in 2015 well before we were married and thinking of doing the green card process negatively affect the following years in which I made above the 125% poverty line for our household. Seeing as the year we got married I technically made enough and still do, do you guys think I will be able to help my wife sponsor my visa? Will USCIS just look at the years once we got married or look at our income before we were married as well? Anyone have a similar situation? Any advice or input will surely help us sleep better as this year has been so stressful as I'm sure many of you are familiar with. 

THAnk you in advance and God bless!