Those are really tricky situations. This happens at my facility A LOT. Back when we used to have a supervising CNA on our shift, I would complain about things like that and nothing would slide by me.
In my opinion, before you leave, you have to check all your residents. Your changing round should be within the last 20 minutes (30 is max) of your shift. The last checking round should be 5-10 minutes before you leave. Why the last round? So you can check that none of your residents have vomited, all the side-rails are up, no one is on the floor, no one is walking around, etc. You would not believe how many residents I have found on the floor and with no side-rails, no diapers on, or those who have G-Tube feedings with their heads not elevated.
If you feel like certain residents are heavy wetters, put extra pads under them. Heck, I sometimes put 3 extra pads because I know some can pee through their diaper AND manage to get the entire bed wet. Hopefully, there is no rule against putting extra pads at your place.
There is another thing. It also depends when the aide that worked after you checked the residents. Who knows, maybe she checked them after 11 pm.
My advice is to tell the aides that work after you that you are new and ask them who is a heavy wetter so you can put extra pads under them and so you can check them the last.
Sorry, but I check my residents within the first 5-10 minutes after I get my assignment and if I see that they are wet (not a little, but a lot) then I will complain. I've worked after many aides that managed to change their residents and most were dry so I know it's possible. I shouldn't have to clean up after people who are lazy (not you, I'm actually thinking about one particular aide at my facility). Seriously, I come to the main nurse's station 10 minutes before my shift starts to get and assignment and the aides are all sitting around, texting (my annoyance level goes through the roof). Keep in mind, some of us complain not because we are lazy, but because we have to clean up after lazy aides. This puts us behind. I don't remember the last time that I got to go on break (during night shift!) because for the first 1-1.5 hour all I do is change entire beds, diapers, bedbaths, and clothes (16-22 residents, all total care). Don't take it personally, but try to get a feeling of who gets wet around what time (I know that this is sometimes impossible). Once you get to know your residents, it will get easier. Don't worry about since you are still new.