Still in the middle of your cycle so I wouldn't worry too much just yet. Good idea to keep testing until you see 0 amm and nitrite. Did you add an ammonia source? Ordinarily there is no need for water changes during the cycle but your little snail might not make it through
at the end you will see high nitrates and that's when it's time for a big water change and livestock! What's your initial plans for the tank?