Contraception - all forms of it - are only 99% effective, I'm afraid. No company is going to claim their contraception is 100% effective because there are always going to be people who would sue them if/when it failed and a pregnancy occurs.
I was 19 when I found out that I was pregnant with my oldest. I was on the pill (don't remember which one), had just left her abusive biological father (after a relationship of 14 months), was given the wrong information (the GP told me I was past the then-legal point of terminating, when actually, I was a lot less pregnant than she thought I was... and when I found out she'd gotten it wrong - it's not an exact science, after all, and this was based on when I'd last had a period as opposed to an actual scan - I'd grown attached to the fluttering bubble of a baby inside of me), and ended up continuing with the pregnancy. Which was, quite frankly, the most hideous time of my life and I spent most of it in and out of the local hospital. I developed ante-natal depression, I was still trying to heal from the abusive relationship and come to terms with the fact I was going to be a lone parent, I lost my job, I was horrendously sick/had kidney infections galore... but at the end of it, I had a beautiful baby. Whom I love tremendously.
Four years later, I had a termination. I was in a long-term relationship, but he was off travelling and doing his own thing, and the pregnancy was a result of another contraception simply not working for me. Do I regret it? Yes, and no. Some days I know it was absolutely the right choice for me, and others... not so much. It would have been 19 this year, and I sometimes catch myself wondering whether they would have looked like their father, or me. But my first pregnancy had been so awful, that I knew I couldn't go through that again - especially not whilst caring for my then-4 year old. I was also in my last year at university, and my degree involved a lot of climbing in and out of trenches/hard manual work. Had I continued the pregnancy, I could have kissed goodbye to my degree. The father's lifestyle would have continued regardless...
Four years after that... I fell pregnant, to the same man who'd fathered the termination, with twins. I only managed to carry one of them to term, and he's now a strapping 14 year old who makes me smile most days. My pregnancy, this time, was less stressful even though I'd not planned for it - yep: contraception fail again. For some reason, the various hormone pills simply don't work for/with my body. So that's four pregnancies, if the twins count as separate ones, all whilst I was on contraception. I cannot help but wonder if my termination contributed to the loss of my son's twin - however rational that might be, I don't know, but I do know that there is a chance it contributed to the weakness in my cervix. I was incredibly lucky to manage to carry my son to full term. I know that. I'm grateful for his survival. I also managed to finish off my PhD during his first few months of life. His father's life continued regardless - nothing stopped him from doing what he wanted/when he wanted...
My daughter is now a young woman who flits in and out of relationships. She knows that no contraceptive is guaranteed 100% effective, and has already stated that she would terminate if she found herself pregnant at a young age. She knows that I would/will support her through whatever decision she would be making, concerning her body and her life.
Whatever choice you make, Cassandra, whatever decision you come to regarding this pregnancy - be aware that the GP appointment is simply to register the pregnancy and support you through either continuing with it, or terminating it. It is to ensure that you're not being pushed into anything you don't want by your boyfriend.
Your boyfriend's life will continue on as it is, whether you continue or terminate. Men don't suffer from morning sickness, a loosening in the pelvic girdle, swollen ankles, kidney/bladder infections, an increased risk of thrush, the stretching of the skin and mild displacement of body organs. They just blithely watch us endure and put up with it all... and don't really understand the process, completely. My son's father, I recall, couldn't grasp that I wasn't able to run the length of a football pitch, because I was the size of a small house and couldn't breathe properly when my son decided to stretch inside of me. Or how many times I'd have to get out of bed in the middle of the night to pee, because he was dancing on my bladder/I had a kidney infection. He knew the theory of pregnancy, but not the actual practice of it. And it is, as I'm sure many will agree, bloody exhausting growing another human being...
Whatever choice you make, please don't let anyone else make it for you. 