I feel like I should post an update to round this thread off.
I ended up sticking to the advice given here - keeping vitamin d levels high, watching my diet, staying active and meditating and had a great pregnancy. I added some lean chicken and occasionally ate eggs and red meat when I craved them but stayed clear of all the other foods pregnant women normally crave like chocolate and cake
I had a whole barrage of medical appointments as I was technically high risk which were so depressing but I stayed patient and stubborn, eventually getting (and having) the calm home water birth I wanted using hypnobirthing techniques. I had to compromise by filling out a disabled persons care plan (not sure if they have those outside the UK) but in the end, my team of midwives were just amazing and so supportive. I made the case that staying out of hospital would keep infection risk and stress levels down which they agreed to as well.
So far I have had no problems - my little girl is two weeks old now. I have a follow up booked with my MS nurse in a few weeks to see how we are getting on. I'm breastfeeding and hopefully can continue with that.
I feel like a very lucky woman indeed
Thank you to everyone who posted replies to help me through!