I went on my honeymoon at 15 weeks and it was great. I was pretty worried about going in the lead up as I hadn't been before and wasn't sure what to expect. My Dr said to go and have fun! I stayed away from salads and the other common no no's and mainly ate well cooked food. I tried to stay away from ice in my drinks (mocktails =) ) but sometimes i forgot to request no ice and had no issues. A lot of the people i spoke to over there said the ice from the bigger hotels was generally fine anyway.
Have a great time.