happened to me several years ago! Brought in a stray from work that I swore was pregnant only to hear she is actively nursing! She had been at my house overnight and not knowing how old the kittens might be, i felt terrible! (Around here, raccoons will go after kittens and newborns can't live for 24 hours with no mom milk). Of course I released her and managed to find her feral four living under an old living room chair on the porch of an old man who would shake his fist at me everytime I came around to get off of his property! They were under the chair with a long dead squirrel that mom had given them! All were socialized and placed in homes and I still have then kitten Dorian!
If at all possible, it's really best if you can watch the trap. If you can get them used to going to one place for food at a specific time with a specific call, you'll have no problems with the wait! If you can't watch the trap and cover it immediatly, then cover the trap before you leave- it will help keep the others from freaking out when they see the trap door go down and the cat inside freak out. Also keeps the cat inside calm. Be careful to lay the cloth that you use to cover so that when the door goes down, that end is covered but not too long so that it catches in the door and prevents trapping at all (from experience, an almost trapped cat will be forever trap shy and you'll never get that cat again!).
If you have to keep a feral in your house overnight, they are truely happier staying in a covered trap where no other pets will bother them. Longer than overnight, use a small cage so you can provide litter etc. and also more easily get back in the trap when it's time to move them. (Be careful for the quick to escape!) I don't know how you're going to catch the one in your bathroom now! May be a keeper!!!
Keep us posted for sure for sure!!