Ear infections

Mi

Pretty sure my daughter has her 2nd ear infection in about 1.5 months. Going to take her to urgent care in the morning. I took her back to her doctor 3 ish weeks ago and the 1st one did clear up, but her eardrum was stuck inverted so she’s on Zyrtec and Singular to hopefully help resolve the tube congestion. I was hoping this would prevent subsequent ones but I don’t think it did. I can’t remember the general rule for tubes.. is it 3 or 5 ear infections within 6m? Anyone else struggling with this?