Ai, this is tough lah, managing Covid with two kecik-keciks sambil pregnant 26 weeks, memang heavy. A few of my mum friends kena during pregnancy jugak and they were okay, tapi setiap orang lain, so I really think you should text your gynae or call the clinic sobit to check, especially pasal the chest tightness (even if it's just the blocked nose, better safe than sorry masa pregnant). Just rest as much as you boleh, drink lots and try to isolate from the kids kalau possible so hubby can help, I know easier said than done when you're the one running everything, tapi you need to take it easy especially now. Monitor yourself closely; if the breathing feels different or you rasa dizzy, jangan delay, go to the clinic.