I was 17, nearly 18, and OH was 20 at the time. We were using condoms and the pull out method, as my previous bc was making me extremely nauseous. I'd been telling him for a week that I thought I was pregnant, and he kept saying no way, no way, not possible, etc etc. He ended up buying me a pregnancy test and I took it while he waited in the next room. I didn't really have to tell him, I just walked in shaking and was crying. But he took it surprisingly well! He's actually been super excited from the very beginning, and he was the one to calm me down and reassure me that everything was going to be fine.
With our first baby, however (on bc at the time, no condoms or pulling out) he wasn't nearly as excited. He wanted me to have an abortion (I was barely 16, he was about to turn 19) but after a few weeks he got used to the idea and was okay with it. Eventually, towards the end of my pregnancy (ended in miscarriage at 2 1/2 months) he was beginning to get excited and was really upset at my mc.
Also, I'm not sure if this thread will be locked, as you're not actually pregnant.