Hello people.

I was recently naturalized as a US citizen and had applied for a passport a few days after. But then, I received an emergency call and had to go back to my country of origin. So I applied for an emergency passport, which was really smooth and convenient, and I was immediately given one that is valid for six months.

Upon checking-in at NWA, I was told that they couldn't board me because the passport validity of my destination country has to be at least six months from the date of contemplated return. It was a Saturday and the Regional Passport Service I went to was closed and would not open until the following weekday. Besides, I didn't want to change my flight since it was a valid emergency worthy of an emergency passport (which is why I was given one). Nonetheless, the NWA agent told me that there was nothing she could do. I was an hour away from my departure and still had not checked-in nor passed through the TSA, so in an act of desperation I told her that I was a dual citizen since I had brought my foreign citizenship's passport with me, and that its expiration is years away. It had worked and she boarded me, but registered my foreign passport's information instead.

When I arrived at my destination, I showed my US Passport instead and got the stamp for it. I had no problems at the immigration even with the less-than-six-months validity of my passport.

Now my question is would that cause any problem when I return to the US? What sort of questions should I anticipate upon arriving at my port of entry?

I've been thinking about it all the time and searched the Internet but I couldn't find a targeted answer. But essentially, I am just scared I won't be able to enter the US because of that.

P.S.
I went to the US Embassy to renew my passport but I was told that it would take at least a month (which I have) before I could get a 10-year passport. And I am now legally a dual citizen.