Rapid weight gain from new workout. Is it water?

Hi guys

I have been weight training for a while but did a new workout on Monday night, including heavy deadlifts that I haven’t done in a long time, and have seen my weight shoot up 2.7kg in 3 days post the workout which is very unusual for me. My weight previously has been very stable.

I’m sore this week from the workout and I also feel watery and bloated. I can see and feel the bloat around my midsection in particular. Do you think this is water retention from DOMS and muscle repair? Will it go away and should I keep working out and lifting? I have been eating well and staying very active so I don’t think it’s fat gain, it’s just a lot in a small amount of time and something I’m not used to seeing change.

Thanks for any advice/similar experiences!