Hindi na ganitong normal sa 25 weeks, mama, usually by second trimester the nausea should na away na, kaya okay lang i-check with your OB kung ano ang cause, baka anemia, blood sugar issues, or something else lang na madaling ma-address with proper guidance! In the meantime try small, frequent meals na easy sa stomach mo like congee or fruits, at hydrate well, pero talaga best to get it checked out para ma-rule out kung may underlying concern.