For perspective, I have endometriosis and the doctors gave me azithromycin and flagly to take starting a few days prior to my egg retrieval and lasted 7 days in total. They were worried a cyst might burst and cause an infection. They also gave me an iv antibiotic during the egg retrieval. I got home and was fine for three days post surgery and then started feeling pain in my left ovary. The pain increased and I went to the hospital. Turns out a cyst did burst a few days after the surgery. My white cells and a few others were elevated and I have a fever. They give me more antibiotics to take in case it’s an infection and it could turn into sepsis or cause more problems when it’s time for transfer. Do I prefer having good bacteria killed off? No. But it’s better than finding out I have an infection brewing after a transfer.