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antibiotics won't help with a fungal yeast infection.
yellowish discharge can be from a bacterial vaginosis infection.
have you been sexually active?
who gave you the antibiotic shot?
antibiotics can actually kill good bacteria in your bowels which can cause diarrhea
and can kill good bacteria in your vagina which can lead to bacterial vaginosis which can cause discharge
I'm not sure what infection your prior antibiotic shot was treating.
yeast infections need antifungal treatments, not an antibiotic shot.
sexual activity can lead to infection or trauma.
is he wearing a condom?
he could be spreading an infection to you as well.