Hello, and I hope I can help you today. Ecstasy, or MDMA, is a kind of a stimulant drug, and though it s prolonged used during pregnancy puts the unborn child at risk for behavior and developmental problems, one dose in the first trimester will not harm the baby. So if you want to keep the baby, there is no medical reason why you need to worry about the pregnancy. You may need to re-evaluate your relationship if the baby s father pressures you into doing things that can harm you or the baby, but for now, there is nothing to worry about. You should begin taking prenatal vitamins though, any brand is fine, and they can be purchased at your local pharmacy. I hope your situation gets resolved and I wish you the best of luck with the rest of the pregnancy, Dr. Brown