I cruised through Malaysia and Singapore whilst 21wks pregnant, I had travel insurance and I had a fantastic time. I slept like a log and had an awesome nap every afternoon in the cabin. I was careful with what I ate but not overly cautious. Keep up your hand washing and sanitiser and all should be fine. It was a wonderful trip and it was very hot and humid so I made sure to drink lots of water, but honestly it was my last chill out before bub arrived. I had more trouble finding properly cooked meat in Singapore restaurants!!

I hope it works out how you want - it's a shame if the worry will ruin it for you. Good luck :-)