No, it wouldn't be from cycling. What kind of fish do you have in there right now?
To cycle your tank with fish you need to do a 10-15% water change every couple of days and test it after every week and a half. It will most likely be high in ammonia and low nitrites the first test or two, but this is just the beginning of the process. Keep doing this for about 4-8 weeks or when your parameters become stable and your tank should be cycled and you won't have to do so many water changes. If you plan to add more fish afterward, just add a few at a time
*Remember, cycling is different for everyone and depends on a number of things like the amount of ammonia in water for bacteria to digest, the availability of bacteria in atmosphere to colonize filter, water changes, waste (ammonia and nitrite), amount of excess decaying matter in tank (dead fish, extra food, plant leaves, etc.), and the presence of toxins/anti-bacterial agents/sanitation chemicals in tank water.