How about opening your luggage outside and shaking out everything. Then inspect your belongings closely. You may not see live roaches, but remember they do lay eggs rampidly. Live ones may not have come home with you, but they may have sent their eggs with you.
Before you bring everything in, spray with a bug spray that says it works on roaches. Roaches are very resilient to pesticides. Be careful though and check the can to make sure you will not damage the surface you are spraying, including your clothing. Don’t forget to spray your car. But again, check the can to make sure you will not damage what you are spraying. Remember to treat your suitcases. If you can use the spray, enclose what you are treating in a big green garbage bag then spray the spray in the bag and seal it up for a time.
If you stepped on roaches in your room with your shoes, be careful. infestations are often caused by stepping on roaches, the eggs get caught in the treads of your shoes, then you track them into your home. The eggs can lay dormant for years so don’t be fooled.
Maybe someone can speak to the question of whether or not the cargo holds of the planes would be cold enough to kill the roaches. But I’ll bet that wouldn’t kill the eggs!! How about calling an exterminator for advice? You local health inspector may have advice too. They deal with roaches all the time.
Good luck. I think it was a good thing to just not bring your luggage into the house until you are sure.
Let us know how it goes