Spotting or period?? Helpp

So I just got on birth control (Skyla IUD) on May 20th.. my period for May ended on May 21st. (I got the iud inserted on my period)

The past couple days (27th, 28th, 29th) I’ve been bleeding.. (I had unprotected sex for the first time with pulling out on the 26th and 27th)

I’m concerned as if this is spotting or another period. Because it’s not a heavy amount of blood but it’s been constant for 3 days so far without stopping but VERY light. Every time I go to the bathroom and wipe there’s blood or there’s blood in my underwear.

Is this a common thing with getting an iud so soon? Would I be having another period right now even though I just finished my regular cycle on the 21st?