You’re experiencing strong nausea, a backache, and lower abdominal pain, and you’re wondering if you might be pregnant. These symptoms are common in early pregnancy, especially if you’ve had unprotected sex recently. However, they could also be caused by other digestive issues. The best way to find out is to take a pregnancy test. This will help confirm whether you’re pregnant or if something else is causing your symptoms.

Based on your menstrual cycle, you are approximately 4 weeks pregnant. The conception likely occurred around November 17th, the time you had intercourse . It's important to confirm your pregnancy with a medical professional and schedule regular prenatal visits. Taking prenatal vitamins and avoiding harmful substances like alcohol and tobacco can promote a HEALTHY pregnancy .

After taking the emergency contraceptive pill, it is common to experience changes in your menstrual cycle. The bleeding could be a withdrawal bleeding or a side effect of the pill. Howeevr, it's best to consult with your doctor for a evaluation and personalized advice. 

Vaginal itching is a symptom that can be due to a number of causes, such as yeast infections, bacterial vaginosis and STIs. It is necessary to go to a gynecologist for a correct diagnosis and treatment.