Airlines allow domestic travel up to 36 weeks usually, but a green signal from your doctor is a must. Wear comfortable shoes, stay hydrated, and use compression socks on flight.
I was so nervous about cabin pressure and radiation! But my gynac said the second trimester is the safest time, just carry your file and walk a bit on the plane.
Since every pregnancy is precious, especially after IVF, please take extra care. Do consult your doctor first to ensure your placenta and cervical length are completely fine before traveling.