This is what keeps me leaning towards relationship issues, be is fighting, Kurt asking for separation, infidelity, what ever it may be.
If it was something pregnancy, MC related she would post the three of them huddled, praying, blah blah. Instead it's Fox bait.
The images she posted the other day, of their wedding day, of her labouring with Fox with Kurt holding her, would fit. Posting these huge iconic moments in their relationship would be a big manipulative F U to Kurt if they are having relationship issues. Guilt trip big time.