Hi mama! Ang discharge during pregnancy is totally normal talaga, pero kung concerned ka about the amount or if it smells weird, mas better na i-mention mo sa doctor mo next visit para peace of mind lang. About your weight, 6kg gain by 22 weeks ay okay na, some of us gained around that time din, pero ang OB mo ang best judge if it's on track for you specifically, so just bring it up sa checkup mo!