Yes, you can absolutely cruise at 20 weeks pregnant, as this falls within the "safety window" for almost all major cruise lines. In 2026, the industry-wide policy for lines like Royal Caribbean, Carnival, and Disney is that pregnant travelers are permitted to sail as long as they have not entered their 24th week of pregnancy by the end of the voyage. Since 20 weeks is well before this cutoff, it is often considered the ideal time for a "babymoon" because the morning sickness of the first trimester has usually passed, and the physical discomfort of the third trimester hasn't yet begun. However, you are legally required to provide a doctor's letter at check-in stating your due date and confirming that you are fit for travel and not experiencing a high-risk pregnancy. It is also vital to ensure your travel insurance specifically covers pregnancy-related complications and to be aware that shipboard medical facilities are not equipped for neonatal intensive care or complex obstetric emergencies, so choosing an itinerary with good land-based medical access is a smart precaution.