What's the likeliness of pregnancy? 4 negative tests?

By over thinking it you can trick your body into thinking you are pregnant. Stopping the vitamins can contribute to the acne and just being paranoid can cause the other symptoms. Nothing is 100% effective except not having , though. But if you had the pregnancy hormone in your urine the tests would have come back positive. Don't worry about it so much. As long as you are taking precautions you will be fine. But if you do miss your period and still get a negative test result, you may need to see your doctor and check for a hormone imbalance. Good luck.