Good morning! Honestly, it depends sa airline, a few of us tried flying around that month and some airlines asked for a doctor's clearance while iba naman hindi na kailangan, so mas safe talaga na makakuha ka ng certificate from your OB just in case. Most airlines allow travel up to 36 weeks kaya ikaw ay okay pa, pero better contact the airline directly din bago mag-book para alam mo exactly ano ang requirements nila at makaiwas ka sa hassle sa airport!