I'm going to assume you're 12 weeks pregnant - yes?
I think you were taking on too much to expect to be able to carry a F/T job and P/T job and a 10 month accelerator course, which I assume would have some pretty stiff studying requirements. You're not leaving a lot of slack in the system there - although I admire you're determination!
I'm not sure how far along you are in the course, other than its more than 3 months. Assuming you are 12 weeks pregnant, you could still be feeling very tired, which usually starts to reverse after about 14-16 weeks. I know my energy levels bounced back big time 16 weeks +, so can you hang on in there for another 2-4 weeks?
If the company aren't going to budge, is there any flexibility / opportunity to change your paid work arrangements to give you more time to complete your studies? Are you planning to reduce your hours anyway as the pregnancy progresses and maybe you could bring that forward?
To be honest I think its pretty standard in the training / educational world that once you have completed the introductory phrase of a training course, that re-funds are off the board, as you are seen to have 'consumed' the training. Many training companies / colleges don't offer deferment as they may not run the courses back to back, depending upon numbers enrolling so they can't commit for a year in advance. if there's a chance the syllabus will change, this will also effect how they treat students - I know this caught out someone I know - the college couldn't offer a deferral as the syllabus was changing after 'our intake'.
Maybe the question to ask would be, how much of a discount could they offer to you, to resume the course at a later date.