Sure t and inflamation on the site

Hi, I have decided to try the sure t a try and found that i dont mind the self insertion but i am having a problem with my site. I had the sure t inserted for 3 days and when i removed it i have this hard

bump on the site and i am wondering if this is normal. I know the minimed recommend changing every 2 days. I sure to have better control over this than the soft set where the cannola was bend and i ended up in the hospital whith Ketosis which was crazy spending couple of days at the hospital.