Period confused

Alright ladies, please help me out. I’m really confused right now. My period cycles are pretty irregular. Last month my cycle was lasted for 34 days and I had 5 days period last month as usual. This month my period started at day 12/05/19 and it stopped completely at day 14/09/19. Yesterday, it means 15/09/19, I had completely clean, no blood or whatever. But today on 16/09/19, when I went to toilet, I saw some spotting on my underwear. Is it my period show up again? Please help me out. I’m so confused.