forgot retainer for 5 day trip. (slightly freaking out)

With the memory of a goldfish that I have I of course went and forgot to bring my retainer with me for a 5 day trip. I literally got everything except my retainer. I've been wearing it every night since I got my braces off about 4-5 years ago, and I'm nervous to go this many days without it.

Even after a day when I would put it on in the night, I always notice it feels a bit tight for a few minutes, so I'm not really sure how my teeth would react to going 5 whole days/nights without it. I'm worried my retainer won't fit once I get back. I'm most worried about my lower teeth shifting a lot, since they were the most crowded before they got aligned.

Any advice or experiences you guys can share would be much appreciated. I guess I probably won't repeat this mistake in the future lol.