Medical professionals and theme parks strongly advise against riding roller coasters at any stage of pregnancy, including at 6 weeks. While the fetus is very small at this stage, the primary concern is not direct impact but placental abruption—the premature separation of the placenta from the uterine wall caused by intense G-forces, rapid acceleration, and jarring stops. Even in the first trimester, these forces can put the pregnancy at significant risk. Furthermore, 6 weeks is often when morning sickness and dizziness peak; the intense motion of a coaster can severely exacerbate these symptoms. In 2026, every major coaster has a prominent warning sign for expectant mothers. For a safe 2026 visit, it is recommended to stick to "Low Intensity" attractions like boat rides, slow-moving dark rides, and stage shows, which carry no such restrictions.