Hay, I feel you, ang stress nito sobrang laki talaga! Honestly, 19 days delayed with symptoms is really worth checking with your OB na, kasi sometimes the hormone levels are just not high enough yet to show on a PT, or sometimes it's a false alarm from stress or hormonal changes (a few of us had that happen din, parang lahat ng pregnancy signs pero delayed lang period dahil sa anxiety). Better to get a blood test or ultrasound para sure na, kasi waiting like this is torture, your doctor can give you actual answers instead of guessing pa lang, and if may something going on, makikita nila na agad.