Hello,
We went through the same situation and here is our personal experience.
The I-94 expiration date was never ever brought up in our journey. HOWEVER, your results may vary and always provide a clear explanation IF you are asked for.
We did not provide health insurance as evidence. Other sources of evidence can include: Utility Bills (with both your names on it), Joint Bank Accounts, Phone Bills, travel receipts, and lots of PRINTED photos, trips together etc.
As for evidence:
- Open a join bank account
- Add both your names to the utility bills (Gas Company, Waste/Landfill, Water bills, Phone Bills) - these are faster to do with less turn around time.
- Print lots of photos and the date and places you both have been.
During this stage that you are in, it would be best not to travel outside of the country until you receive a Green Card. We were very strict on this, even road trips out of state were out of the question.
2 weeks expiration does not seem so bad. IMHO. Good luck!