Speak with your GP or obstetrician to see if travel is safe in your particular circumstances, how you can reduce the risk of blood clots, and whether you need any vaccination or medications to take with you. Check with your airline what their policy is on flying when pregnant, some of them require you to carry a medical certificate. And check that you have valid travel medical insurance. I did a Contiki tour when I was pregnant, confident that I had ticked all those points before I booked my tickets. Family Doctors Plus has a travel medicine clinic, provides all travel vaccinations and individualised travel packs.