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Hi, I would consult your doctor for advice.
best wishes and congratulations if you are pregnant., Elizabeth.
I was pregnant and flew last year when I was about 26 weeks.
You need to check with the airline you are flying about their policies. I flew with Ryanair and if I remember correctly they take woman up to 32 weeks and after you need a letter from doctor saying that you are healthy.
I am not sure about first three months as they can be tricky so it's better to check with doctor.