Trusting IUD

I was wondering if anyone has any pointers on how I can become to trust my IUD. I feel like I am always paranoid that I am pregnant because I don’t get my period, and I think sometimes I chalk up IUD side effects to potential pregnancy symptoms. I have had it for 9 months and still get worried. I always check my strings but sometimes even convince myself that they feel longer than before. I’m sure this isn’t a common problem. I just feel like I’m constantly stressing about every little change.