The weight gain may have nothing to do with the change in lifestyle ... then again, it could be. But women can fluctuate 5 pounds just because. And then there's the possibility that the change has caused a bit of constipation ... which is normal until the body adjusts to not having as much gunk to pass along. If you are feeling good, I wouldn't worry this early in the game.

I did my first weigh on Sept 7th after starting paleo on Aug 7th, I lost 25 lbs the first month and feel awesome. I haven't decided if I want to do weekly or monthly weigh ins. I am sure after 2 days its not a good indication, I would stay away from the scale at least for a couple weeks then check back in and I bet you see a good difference.

Primal/Paleo works in totally different ways to a traditional plan. Remember this is more a lifestyle change than a quick fix diet. I don't find that I can 'eat whatever I want' as many Paleoer's do (and by that I mean not worry about portions etc) and I definitely need to stick with logging my food but you should yield a loss. I think that putting the scale away and not focusing on weighing is a much better plan. I weigh maybe every 6 weeks. Yeah it's difficult to not be curious but it makes the results a lot sweeter.

Remember that you are increasing your fat's and protein (usually) and decreasing your carbs. You will see good results if you can keep your carbs below 100 grams per day. You do need to amp up your workouts though.

Try to ignore the scale and go by how your clothes feel. Pounds/kg are just numbers and mean nothing. Your aim should be a more healthy lifestyle, and the added perk is your body changes, you feel great, and look even better. Keep up the good work!