argh anyone else feeling fat already?

Nikki • Wifey to an amazing man, RN, mama 1 beautiful baby girl and 3 fur babies. TTC #2!
My jeans are already feeling super tight at 8+2 what the hell! I'm pretty lean and I feel huge already it's awful. Any tips? Suggestions? I'd love to try to lose 5lbs while in the 1st tri but I'm not sure if it's advisable.