I flew to Thailand at 11 weeks!! came back just before week 14. What I would recommend is getting your nuchal scan booked in for your return didn't even think a bout the timing when we booked. Got back with 3 days to spare before cut off date!
I personally had 2 losses previous to being pregnant this time (I'm now 39+5) but as things were looking so well I went ahead. Drs gave me all clear and I booked a scan before I went just for my own peace of mind. So if u have no issues then I would say go.
How is your sickness if u have any? I had sickness from 4pm every day but it eased off whilst away BUT I have to admit that the last 2 hours into Bangkok I was very sickly (but not sick) and tired even tho I hydrated like mad and coming back to heathrow I pretty much threw up the last 3 hours. I was sick whilst away but found it much more bearable mainly because u r not rushing around at home.
Who are u flying with? as would recommend taking plenty of snacks if your airline doesn't offer them throughout the flight. The obvious things are a must, flight socks, keep active, book an aisle seat so can pee (or puke) at will! Stay hydrated, let cabin crew know u r pregnant. A good crew will help you stay hydrated and if u do feel bad in flight they can monitor you and be on hand if needed. They are trained to do so plus when u really feel rubbish they'll queue jump u if needed at the loo or give u extra bread rolls, bland food to eat. I work for an airline too (not crew tho) and see reports of what happens in flight and pregnancy really doesn't affect that mny people.
I love to holiday and this baby has travelled so many places and he or she is not even born yet.
As everything was ok it didn't really stop us whilst there. A few earlier nights and cowering under the sun umbrella more. Be warned the heat is very different to deal with when pregnant. I don't think that's too high a season to go but will still be hot. We went on elephant treks, speedboats etc. I just always told our guide and they really looked after us, even got us the slowest mildest elephant to ride and took us off to meet ele babies!
A cautionary word tho....like one poster has said above, I would be careful with food. I've been to Thailand twice and the first time I caught salmonella and a very nasty bug on top of that from eating those yummy pancakes at the side of the road. Due to not being treated right and being given incorrect results in the uk.....it had a very nasty consequence or me! So this time round I was very careful where I ate and what I ate....and no matter how nice the street vendors food look.....I would say don't take the risk.
Make sure u have insurance that covers pregnancy and take your notes with you.
Also if u want to indulge in massages, buy a small bottle of john sons baby oil for them to use on you then you don't ave to worry about what oils are being used.
Man I've gone on but I loved Thailand, if u and baby are well, go for it!