What could be causing my frequent infections (oral thrush, bv, bladder) each at least twice in the past 2months and i had finished all antibiotics?

Different causes: Antibiotics may increase your risk for yeast infections. Bv and bladder infections are typically bacterial and treated with antibiotics. Have you been reexposed to a sex partner who may be effected ( re bv)? Some women have bacteria introduced to their perineum during sex which can increase UTI risk. Voiding after sex can help prevent those.