Yes, it will go back, but stop putting things in there for a few days.
When you do this, make sure you use lube - that's a must. It can be lotion, vaseline, or lube for sex - but you need to use that.
Whatever you're using to insert, make sure it's clean first.
Here's a pretty decent article. Don't read it when others are around. :)
https://metro.co.uk/2016/10/06/how-to-safely-and-enjoyably-use-anal-sex-toys-without-hurting-yourself-6175134/
And go slow.