I recently had the mirena removed in July. Immediately after I returned to have the average cycle I…

I recently had the mirena removed in July. Immediately after I returned to have the average cycle I have prior to having the mirena since then my cycle has continued to come on time every month last week of month . Should have came last week of October hasn't showed up yet . Thought it was strange for it to have been on time immediately after removal and then change now . I took a pregnancy test but was negative.