If your pregnancy is normal, travel can be fatiguing and frustrating, but you should be able to travel during the first and second trimesters without much trouble.  If you plan to travel during your third trimester, consult your physician first.

During trips, especially long ones, take frequent breaks to stretch your legs.  Places where changes in climate, food or altitude might cause you problems should be avoided.  Also avoid places where good medical care is not available.

Consult your doctor before taking a trip.  Each situation is different but mostly travel during pregnancy is ok.  Some things to consider are:

It's ok to drive but always wear your seat belt.  Some women are confused whether wearing restrains over their abdomen could cause problems but restraints are just as necessary during pregnancy as they are any other time.  You have a better chance of survival in an accident while wearing a seat belt than not and there is not evidence that using safety restraings increases the chances of fetal or uterine injury.

Don't plan a trip during the last month of pregnancy.
Labour could begin at any time in the third trimester, your water could break or other problems could occur so it's not a good time for either you or your partner to travel.  It's best to be where uyour own doctor and hospital has all your pregnancy records.

Avoid travelling if you're having problems such as bleeding or cramping.

If you have problems with swelling, sitting in a car or walking a lot could make things worse.

Its not a good idea to travel if your pregnancy is considered high risk.

Be sensible when planning a trip, keeping in mind you are pregnant and take it easy.