Hey Charlotte.
Your situation is actually a bit similar to mine last year, in a sense I can relate.
I was at UWE last year doing the first year of my degree when I found out during freshers week that I was pregnant! I had broken up with the father before going to uni. It was really tough! I have an amazing support network now as I'm back home, but whilst I was in Bristol I had nobody.
To cut a long story short, uni were pretty useless at helping me with anything, I did miss classes as I was exhausted, but I did get through it. I moved back up to Scotland last May and missed my exams, but went to sit them in the re-sit period in August, and passed. I couldn't have stayed to do them as I was due on the day of my first exam, dd arrived the day before lol!
I thought I'd return to Bristol with dd and carry on doing my degree, but I just couldn't do it. No support down there, and I wasn't ready to leave Charlotte (my dd). I suffered from pnd and have only just gotten over it, my ex hasn't seen her since 10 weeks and she'll be one next month.
The point I'm making is, you will be fine. But you cannot work yourself too hard. If you don't feel up to doing your exams, apply for extenuating (sp) circumstances and sit them at a later date. I'd also take the year off from uni and stay at home with the kids, it'll do you the world of good. You can apply to head back to uni the following year. Don't try to be superwoman, you'll just exhaust yourself.
Where is it you're studying? It's a shame I'm not in Bristol anymore!!