Diagnosed with GDM but low sugar now without taking any meds yet

Mga momsh ask ko lang po since i was diagnosed with GDM a week ago then sabi ng IM doctor ko which was referred to me by my OB, monitor ko lang daw blood sugar ko 3x a day in 1 week and mag less carbs lang daw. Then balik daw ako for ff up check up. Pwede mag rice but half lang damihan nalang daw ulam. My concern now is ang baba naman ng sugar ko after 2 hr meal.. minsan ranging from 70 to 80 lang. 2days pa kase follow up check up ko kay IM. Anyone here na naka experienced na nito. Kaka stress 😢 29 weeks preggy. TIA