As long as the condom was intact when you finished, you have no worries.
It's mysterious to me. I have no other ideas or suggestions. Sorry.
I did ask, but considering it was a one time thing I really don't know if I can trust his response. I've had sex plenty of times and have never experienced that before. Again it didn't sound like a fart, more like fluids rumbling around
I never heard of queefing, but found this when I looked it up: "air escaping from your vagina, and it's quite common. During sex, the in-and-out action of your guy's penis forces air into you..." and it escapes later, making a fart-like sound. Seems logical to me that before the air escapes, there might be gurgles.
I see no reason for you to be worried about anything else or to think it means the condom broke. If it had, your partner probably would have noticed and said something. (Why don't you ask him?)