Eh sama lah, a few of us went through this phase jugak! Usually it's stress, not drinking enough water, or sometimes hormonal, especially if you're approaching period or balik working. Try lah increase your water intake, make sure you're eating proper meals, and maybe express more frequently for a few days to stimulate supply balik. Kalau terus jatuh or you're worried about baby's intake, better check with your doctor or lactation consultant sebab sometimes ada other factors yang kena sort out.