Weight gain!!!

I just weighed myself and I've gained 6kg in a week! I know I've been bloated to the point my trousers barely fit but I've not been eating excessively, I'm hungry all the time but I'm eating soup and fruit. Could it be a lot of water weight? I started out at 103kg so I'm not supposed to gain much anyway. Has anyone else gained this much? I'm worried about increasing the risk of things like gestational diabetes and harming my baby 😿