If I complete a STEM field for my 2nd masters, will I be eligible for STEM extension?

Hi there. I graduated last summer with an MBA in finance and began my OPT. Even though I found a company to sponsor me, I was not lucky enough to be selected in the H1B lottery. So, my question is: If I decide to do a second masters, this time in a STEM field, will I be eligible to receive the 17 month OPT extension after graduation?