system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
An 18-year-old G1P0 woman who is 10 weeks pregnant presents for her first prenatal visit. She reports nausea with occasional vomiting but denies bleeding, urinary symptoms, or abdominal pain. She just graduated high school and works at the local grocery store. She does not take any medications and has no known drug allergies. Physical examination is unremarkable. Initial laboratory studies reveal the following:

Serum:
Na+: 140 mEq/L
Cl-: 100 mEq/L
K+: 4.0 mEq/L
HCO3-: 24 mEq/L
BUN: 10 mg/dL
Glucose: 100 mg/dL
Creatinine: 1.0 mg/dL
Thyroid-stimulating hormone: 2.5 µU/mL
Ca2+: 9.5 mg/dL
AST: 25 U/L
ALT: 20 U/L

Leukocyte count: 10,000 cells/mm^3 with normal differential
Hemoglobin: 14 g/dL
Hematocrit: 42%
Platelet count: 200,000 /mm^3

Urine:
Epithelial cells: few
Glucose: negative
WBC: 20/hpf
Bacterial: > 100,000 cfu / E. coli pan-sensitive

What is the best next step in management?
assistant
Nitrofurantoin for seven days