Not trying not preventing

My boyfriend and I have been having unprotected sex for about 14 months. I started tracking my ovulation dates on this app since May. No luck so far, and anxiously waiting for a positive test each month 😊. We don't want to start doing ovulation kits and getting stressed about it, but I did get an ultrasound and blood work to make sure everything was ok and it is! I did notice however when I started tracking ovulation my very regular 25 day periods have turned into 26 to 28 day cycles- maybe I'm starting to over think everything. 😑

Just curious if any of you had gone that long having unprotected sex and did not get pregnant? I figured after that long of not pulling out lol I'd be pregnant by some chance. I feel like I keep getting my hopes up each month and being let down.