Is it safe to lose two kilograms of weight during first trimester of pregnancy?

Yes, it is ok to lose some weight during first trimester of pregnancy. Sometimes due to excessively morning sickness, nausea and vomiting during the earlier months of pregnancy, you may loose your appetite and this leads to - no/minimal amount of weight gain or even some weight loss . Don't worry usually the nausea or vomiting will be settled in few days, your appetite will return and weight will increase. Also visit your gynaecologist for further advice.