Congratulations on your loss so far! That's wonderful!!
I would say yes in answer to your question. Yes some people can/will lose lots more in the space of a week, but losing 2lb a week isn't a bad thing at all.
Losing weight slowly can help to maintain the loss in the long term
The amount of weight you lose in a month can differ for various reasons: how much you have to lose overall, how much you have changed your eating habits and what you ate pre-diet (those who ate lots of fatty foods, or not as much fruit/veg, can see a larger loss in their first month or two whilst their body gets used to the relevant plan), how much your exercise regime changes, how much water you drink, and plenty more.
A lot of people do lose their weight quickly in the first month, but after that it does decrease, especially when you get closer to target.
Good luck for the rest of your journey!