Yes, it's very common, it's called a bacterial bloom, and they normally disappear on their own within a few days.
From what you have said, I need to warn you that you are currently doing nothing to prepare your filter for fish, in spite of what you may have been told eslewhere (especially by retailers).
Your fish produce ammonia as a by-product of respiration, but as you may know, ammonia is highly toxic.Your filter is home to a couple of colonies of bacteria, which convert the ammonia to nitrite, and then the nitrite into nitrate. But for the bacteria to grow, they need food, in the form of ammonia. Just like any other organism, they must have a reliable food source to thrive. You and I would not thrive living in the Sahara with no food or water.
At the moment, there is no ammonia in your water to provide a food source for the bacteria. As soon as you put a fish in there, the food source is there, but it takes time for the bacteria colonies to grow. In the meantime, your fish is poisoning itself.
What we always recommend is a fishless cycle, whereby you pour household ammonia in controlled amounts into the tank, and this provides the food source for the bacteria. Over a couple of weeks or so, the bottled ammonia allows the bacteria to grow to a level where there are sufficient of them to process the ammonia produced by your fish without leaving any ammonia or nitrite in the water to poison the fish.
If you go to the Cycle Your Tank section of the forum, there is a pinned thread at the top which explains in detail how to successfully accomplish this task.
If you just bung in a fish and hope for the best, the chances are high that your fish will die.