TTC & PCS'n

Trinia • Married, 29yrs old. Me and DH 1st time Parents. Currently living on a rock called Hawaii🌴
Has anyone TTC & PCS'd. It's now January and we have made selection but don't know our next duty station yet. We are due to PCS from Hawaii in Sept this year. If we conceived this month then I know I'd be 3rd trimester by time we leave.... How does that work? I know there is a cut off on when pregnant women can fly... Im wondering if we should hold off a bit but we wanted to try for 12 consecutive months & this is the only time we can do that before saying "hey we are having trouble conceiving". So far 4months ttc.