Implantation bleeding or spotting from IUD?

Mothers and sisters I need your help. Ive had the Skyla IUD for barley a month and I already had my period once since being on it, but it was extremely light and oddly long (aug 16-23). Throughout that week I was having sex with the guy I’m seeing and I let him finish inside twice. It’s been 16 days since the first time we had sex, and I just wiped to see this.

Am I tripping? Is this from the iud or is this implantation bleeding..?

UPDATE : 09/04 - I had very very similar spotting to what implantation the 08/31 - 09/01. The top picture is what happened the first day, but the second day it was rust brown ... when should I test?? My period is not suppose to start until the 17st of September and maybe I’m just being extra aware and cautious but I keep cramping randomly throughout the day and my mood swings are way too extreme for my chill demeanor. Haha