Weird spotting after period

I'm on nexplanon and I know that having an irregular period is normal on it. But this never happened before. I just had minor spotting earlier today and I finished my period a few days ago. I'm not spotting anymore but just wondering if this has ever happened to anyone on nexplanon or any birth control?

UPDATE: I'm spotting again. I told my mom (she had Nexplanon before) said that it's normal and annoying.