I don’t know if I flushed the toilet or not and now I’m concerned someone knew

I left the bathroom and two people were there who knew me who are kinda dicks. They were using the urinals and I got out of the stall but I forget if I flushed or not. 

As weird as it sounds I’m afraid they knew I didn’t and are gonna make fun of me for it or smth idk. I checked like 3min later and it was flushed so idk.