Weight loss during 1st trimester

I'm 31. This is my first time pregnant. I am at week 8 from LMP. I wonder is it normal for losing weight during 1st trimester? At first, I noticed increasing weight gradually but for these days, my weight up and down from 47.2 to 47.7kg. today my weight drop fro 47.2 to 46.7kg. pls share if u got same experience or not? thanks