It's still best to consult or ask your OB. Might not be related but ako kada travel ko (though puro local lang and by land), I always check with my OB if good to travel ba ako (btw I'm 21wks). Yung pinakamahaba kong travel by land is long drive na 6-7hrs. Ang laging advise sa akin ng OB is to always stretch my legs to prevent water/blood build up (manas), always hydrate & wear compression socks. So in your case, there might be other things that your OB will advise you to do to safely travel by air ☺️
anyone who travelled ng more than 6 months na, kamusta nman mga mommy experience?