Hello lovely didn't want to read and run, but don't know if I can say anything all that helpful that the other ladies above haven't said but just wanted to say that you would not be alone in having emetophobia and facing pregnancy. I've found some great youtube vloggers (e.g. Zoe Sugg - zoella - and others) who discuss their experiences.
Disclosure: not gonna pretend I have actual emetophobia, as I don't, but I do have real anxiety about nausea specifically (weirdly, I'm semi-OK with actual sickness). I am 6w 4 days after 14 months of ttc. I will just offer my two cents: a) It's very very very likely to be no where near what you are currently imaging it to be. b) If it is bad, you will find ways to cope with it and c) apols as I am sure you already know this and I don't want to add to your anxiety but ttc can take much longer than you might be hoping and that brings with it its own anxieties and sadness.
On a - I have been imaging being bed ridden, unable to eat, unable to cope and live my normal life. So far, its nothing like that - just a nauseus feeling, worse sometimes, but manageable. Many women experience just mild nausea and are vomit free throughout pregnancy. #
On b - are there ways you can build yourself your safety net now, while you know you aren't pregnant? i.e. talking through exactly what your coping strategies will be, writing them down, getting support and agreement from your therapist and partner about how they can help. I find having something of a 'wellness action plan' really helpful in advance for all sorts of MH struggles. Also, you mention work in particular as being a worry, that you could cope if at home - well, this is of course a last resort and something unlikely for you to need but I suspect in a really bad scenario of really not being able to cope with your phobia and nausea at work, there are ways that you can be at home (more flexible working, sickness leave or if its absolutely extreme and you can afford it, change of job/leaving work while you look after yourself). You WILL have options.
On c - get on it girl! You can do this - do you think you could convince yourself to let yourself have a go this month? You can always stop again next month if it's really horrendous to cope with the worry. Chances are you won't get pregnant this month, but if you do, you're unlikely to feel any N or V for several weeks after that.
I really really feel for you - I didn't realise until pregnancy just how anxious I am about nausea (think I'm scarred by some illness in the past that made me feel helpless). But you will get there - this is something you really want, and its one of those things you are going to have to face in order to get what you want - but you can do this :)
Huge Good luck! (ps. not to send you away at all, but the Conception forum is also really good for people going through the ttc-process - although I guess the pregnancy forum can give you insight into how ill people actually have felt).