Same thing happened to me last year . . . was shy of 100k EQM, but made 1K in May, and became GS in June.

Note that I had to have my MP # removed and reenetered for all my itineraries made before my status upgrade to reflect my new status. Although people often post that you don't have to do that anymore, that's not my experience. My gf moved up in status about 2 months ago, and the same happened with her. I had to remove/readd her MP # to reflect her new status on itineraries made before the status upgrade.