Ay, mahirap talaga yan, honestly, maraming buntis na nag-fly to HK without telling work muna, kaya possible naman! The airport won't announce it or anything, pero depende kung gaano kalaki na ang belly mo, kasi scanner lang and routine questions lang nila. A few of us tried going through security without showing, but the thing is if they ask you straight up about pregnancy for health forms, dapat honest ka na lang para sa safety mo at baby mo, plus kung may emergency sa flight, need nila malaman para ma-help ka ng tama. Better advice from one of my mum friends: just book na and don't stress, pero check mo muna with your OB kung okay na mag-fly ka at what week ka na. Goodluck, sis!