If your LO is already on antibiotics for an ear infection in one ear and it seems to be helping, they can't get an ear infection in the other ear, right?

C had a pretty bad ear infection in her right ear- it ruptured right before we got to the doctors on Monday. She's been on antibiotics since Monday and is doing much better- back to STTN!- but now she's been waking up from nap super crabby and has been tugging or scratching her left ear, the healthy one.

Probably just paranoid, right? I just feel so bad that I let the ear infection get so bad before I realized it that now I'm overworried...