No evidence exists of any risk involved in vaccinating pregnant women with inactivated virus vaccines. Even so, physicians always need to consider whether the risk of the vaccine outweighs the potential risk of infection. Vaccines shouldn't be taken just to be on the safe side, but only if there is an actual risk of infection. In the case of the vaccines without live viruses, the risks are very low and the benefit are great, so these types of vaccines are permitted if you are traveling to countries at risk. The suggestion is to give some of these vaccines after the first trimester:

Diphtheria-Tetanus (better given after first trimester)

Hepatitis B

Influenza (It's better given after the first trimester when expecting influenza season. If any special risk is known, it is given also during the first trimester.)

Poliomyelitis

Hepatitis A

Meningococcal Meningitis

Rabies

Questionable vaccines
BCG vaccine for prevention of tuberculosis doesn't seem to have problematic effects, but a skin test is favored to check for infection before and after traveling to a high risk place. Japanese Encephalitis is better avoided since there isn't much info on the safety of the vaccine.

Typhoid vaccination may be OK, but there is little information on the safety of both kinds of existing vaccines against typhoid.

In conclusion, there are some vaccines you should avoid and some which are relatively safe. In any case, physicians will usually suggest you delay traveling to developing countries, and avoid taking even those vaccines that are permitted unless you absolutely must.

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