Hay, honestly 39 weeks is super late na para mag-travel, lalo na if it's long distance, most of my mum friends who traveled that far along ended up going into labor while on the road, and isa pa lang sa kanila napunta sa hospital ng ibang city dahil doon na siya nag-deliver! Best talaga na mag-check with your OB first bago mag-commit sa trip, kasi at 39 weeks pwede ka nang mag-labor anytime, at gusto mo sure na malapit ka sa hospital mo where they know your case na. If it's really necessary, short trips lang talaga ang safer option, pero honestly I wouldn't risk it if I can help it, you know?