I'm not too sure if you've posted something like this before op, but if you have I think that's a clear indication that you already know what is the right thing by you and what you want, you dont need strangers on the internet to tell you otherwise.
I dont want to inflict my experience on you but I'll tell you in the hope that it will help give you. I was once in your shoes, other than we had been dating for 3 months not 6. He did the exact same thing, wanted an abortion, told me it was best, I felt so unsupported and confused. I was too scared to do it on my own, I was only just 22 at the time and had nothing to offer a baby let alone myself. I had the abortion, relectuantly telling myself it was for the best. Let me tell you, a whole year on and even though I'm pregnant again my abortion has to be the biggest regret of my life. After I had it my partner expected us to remain as normal, but I couldn't. Everyone swept my abortion under a rug and it became the elephant in the room, everyone knew but no one mentioned it. And I came to the realisation that was because it affected nobody other than myself. Not even my partner was grieving like I was, infact he seemed quite happy to be over that part of his life and move on, never speaking of it again. Whilst it silently ate me up inside and got in the way of mental health. I lost jobs and people over it and most importantly abit of myself and my baby. I still suffer alone to this day, I silently grieved the anniversary of my abortion, wonder how old he/she would of been and even carry the guilt of my actions into my now pregnancy, wishing that I had been stronger to stand up for myself and my then baby, wishing I had been strong enough to have been able to bring them into the world. I'm not saying you will undergo all of this of course, this is a very personal experience. And I'm not saying this to scare you either, but I hope it shed some perspective for you on how things could possibly play out and I say this only because its very clear you dont want to go ahead with this and I wish someone could of shown me what my future held before I went down that route. It is naive for your bf to think your relationship will be the same or even survive this, yes it's not what he wants but by pushing that on you he is forcing you into something YOU dont want either. For someone that you barely know I wouldn't say it's worth putting that person first. Not when you are the one that will have to live with the consequences, be it good or bad. I really wish the best for you op as I know how hard this situation is. But trust me when I say no matter what if you decide to have this baby there is plenty of help out there, you wont be alone, it can be done so dont feel like you cant consider it. Also dont rush into anything or put pressure on yourself, if your still unsure call of the appointment on tuesday and give yourself time to breathe. If I was you I'd even give myself space from the partner, as he will only reinforce what you dont need to hear for his own selfish benefit. You need time for you, to sort yourself out even if that's just a couple of days or a week. Get your head together, figure out how you would do things if you go ahead and how you would do things if you dont. Please dont make any rash decisions x