Implantation? Or hormones? Or both?

So I got my nexplanon removed last Tuesday. So 6 days ago. I started my period the next day (Wednesday) as expected. My period, while on the implant was always regular and lasted a full 7 days. This time it lasted 4. I didn’t bleed at all yesterday and then today I wake up to spotting. Very light but bright pink. Me and my husband had sex the day I go it removed and the day I started my period. Then last night. And well I guess what I’m wondering is WHY AM I SPOTTING?! I literally don’t even remember what my periods were like before I was on birth control bc Ive been on some type of birth control for the past 8 years. And I’m praying I’m not one of those with irregular bleeding and spotting!

Also:

We adecided to try which is why I got my implant removed.

Update: I have had mild cramps throughout the day as well. And it has started be more light puckish and brown