 [ Symptoms ] im only a week late on my period when should i take a home pregnancy test  period was due around the 10th i took hpt on the 12th 16th and 17th all negative i cannot afford a blood test when should i try another hpt [ Disease ] that depends was the ciprofloxacin prescribed for you for a sinus infection that was diagnosed by your medical provider if so you would need to have the right dosage and amount based on your weight and severity of infection these are usually decided at the time you are being examined if you are self diagnosing and using a past prescription prescribed for a different medical reason or if you are being furnished with with a prescription from someone else i would strongly caution you against self treatment in this manner incidentally most cases of sinusitis are viral and do not require antibiotics