Flying to spain at 30 weeks pregnant?

I have a holiday booked to go to Ibiza (quiet part!) in 3 and a half weeks time. I will be 30+ 6 weeks pregnant with my 2nd child when I go and 31 + 6 when I return home. I am flying with Thomson and they are happy to let pregnant women with single and uncomplicated pregnancies fly on short haul flights until 36 weeks. My pregnancy has been great so far with no complications at all. I also managed to get holiday insurance no problem that covers me while i'm that far gone. My first pregnancy was also great with no complications and I carried my daughter to full term. I'm now worried after reading a few things on the net that my doc wont issue me with a fit to fly note as I will be travelling past the 30 week mark. Has anyone flew this far on in pregnancy and if so was your doc ok with issuing a fit to fly? I know its probably up to the individual doctor as to whether they issue 1 or not but as I said, im kinda worried about it now as the holiday is all booked and paid for and my 3 year old is really looking forward to it!! I live in Glasgow so the flight will be about 2and a half to 3 hours long. Any advice would be greatly appreciated!!