Theory Just had a thought about this week's episode

[GrifCannon 102]

So this week's upcoming episode, "The one where Pinkie Pie knows" revolves around Pinkie struggling to keep a secret involving Cadence and Shining Armor. Based on this season constantly changing up the status quo, I have a feeling that the secret is that they are pregnant. It would obviously be something they would want to keep as a suprise and Pinkie would definitely have trouble not spilling the beans.

[MLPFanatic34 3,234]

I'm thinking that's the secret too.