Am I wrong?

My SO and I have been together for 7 years. We have one child who was unplanned due to bc failing. He doesn't want another child and I do badly, just not now. We wanted some type of bc that I didn't have to worry about, so I got the IUD. I was checking the strings regularly like the say, but one day I couldn't find them... Went to the dr and they said it "fell outand they reinserted another but did cut the strings shorter so it's hard for me to feel for them. It takes me forever and it's uncomfortable!! I pretty much gave up on trying to check for them. So I'm done searching for them! Is it wrong of me to do this? I'd be happy with a baby but I don't think he would and I'm most definitely not trying to have another one without his consent.