Since I just received my first FG Art 15, should I start an MEB now or wait to see if the Army is going to retain me after the QMP board?

MEB's aren't something you just jump into on a whim or can flip on/off like a light switch. It can be a lengthy process just to get the ball rolling and get to the point where MEB is decided. If you have medical issues I would go ahead and get them documented now and get things on paper regardless of what the ART15 generates.

For the MEB, do you have a profile with a 3 in any of the categories? A 3 or 4 will auto call for an MEB. If you don't, then speak with your PCP if an MEB is even warranted based on what ever medical issues you have. If your PCP does not feel they warrant an MEB, then that route is probably moot. As for the FG Art 15, if rank is gonna be lost with that FG, then I would suspect you will face separation. As for QMP, I would suspect retaining you would be subject as to what the FG was for. I know my answer if vague, but that's the best I can think of without knowing the specifics. Not that I'm needing to know. But, honestly, it's not looking good for the Home Team, if you catch my meaning.

Wait until you find out. Depending on the nature of the Article 15, you may be retained. An Article 15 isn't automatic separation only automatic referral to the board. The board will take into consideration your prior performance, recommendations of your Commanders, and your comments to them. If you've had a good record up until now and the Article 15 isn't for something that implies poor moral character, you'll probably be retained. If it's for DUI, valid SHARP or EO, or cheating and stealing, you'll be separated.

It's better to await the response from the QMP board. You're a SSG so you won't even be evaluated till the next SSG evaluation board, that's plenty of time to put together some letters of recommendation. That's over a year away for now. Even if you are recommended for separation, you can still initiate an MEB after.