It is usually recommended to consult a doctor when a vaginal infection develops during pregnancy. If you have the opportunity to see your doctor in the next few days, it is advisable to do so. However, if you are familiar with the symptoms of a yeast infection (such as white discharge and itching), you can try an over-the-counter treatment like Canesten. This treatment typically lasts for 7 days and includes both vaginal suppositories and cream to be applied externally. Be cautious not to insert the suppository too deeply to avoid touching the cervix. It is best to apply it before bedtime to enhance contact with the vaginal wall. If you have any questions, consult the pharmacist at your local pharmacy.