Oh, Henry, you idiot.
This isn't even like OTL Anne, where you spent seven long years waiting for her; how long has it been? One year? Two? Brandon's correct; people(not just commoners) aren't going to be happy with crowning your *consort* with the crown that's, y'know, reserved for *monarchs*? And Mary's not even like a duke's daughter, but an Earl's; the Howards and the other ducal families are going to be pissed. She's going to be seen as a jealous, bitter upstart; I wouldn't be surprised if centuries down the line, she's referred to as a witch similar to how Anne was OTL, except this time it's a little more justified.
This is going to be an absolutely chaotic mess, especially if baby ends up a girl (twin girls! Triplets! Just to rub it in Henry and Mary's face!)