It can be a bit quiet for a time, I sometimes have that too. I feel like on average, you get one camper a week so it's not at all strange that you haven't had a camper yet. Just wait and see!
I have camper bad luck too. I get them when I have 10 villagers and can't do anything, but 9 or less and it's a no show little place. Oh well, I always feel sorry for the campers when I do see them, because they have to go through all the trouble to travel to a whole different town with shops and nice animals walking around to talk to... and they just stand around in their tent 24/7.