My girlfriend and I are really worried. Her last period started on March 1st and we had unprotected sex on March 17th. She took an emergency contraception pill just three hours after. Now, weeks later, she's missed her period, and we've taken three pregnancy tests, which all came back positive. She's also been experiencing stomach cramps, lower back pain, headache, nausea, and vomiting. What should we do?

Sounds like your girlfriend may be experiencing symptoms of early pregnancy. The stomach cramps, lower back pain, headache, nausea, and vomiting are common symptoms during the early stages of pregnancy. For nausea and vomiting, she can take Vitamin B6 (Pyridoxine) 25mg three times a day. For stomach cramps and lower back pain, she can take Acetaminophen 500mg every 6 hours as needed for pain. It is important for her to stay hydrated and eat small, frequent meals to help with the symptoms. I recommend consulting with an obstetrician for further evaluation and management of her pregnancy.