Question on antibiotics

Patient: I am currently going thru IVF and my egg retrieval is Thursday. I took Doxycycline for 7 days, 1 pill in the morning & 1 pill in the evening, 100 mg each. Now they are saying I need to take Azithromycin, 6 tablets 250 mg each. Is this necessary? I am not sick or have any infections & am afraid more antibiotic will make me sick.

Symptoms: None