Hey, first of all congratulations to you and your husband.
I did a quick search for you, it seems there may be risks involved.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_u ids=10825043&dopt=Abstract
Quote:
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Mefloquine treatment during pregnancy was associated with an increased risk of stillbirth.
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I have no experience myself with travelling like that though. Best of luck to you!!