Fluctuating weight by 10lbs!

Coral • Ftm with an unexpected pregnancy that has turned into my greatest joy.
I don't know if this is normal but my weight has been fluctuating like crazy lately. I'm 23 weeks and just started gaining weight but I have no way of monitoring what's actual weight and what's water with it changing this much. I was 146 on Saturday and 134 on Sunday. At my check up this week I was 145. Anyone else dealing with this?