Great to hear you had a good scan Bee 
Welcome ExpectingTwins, and congratulations! I'm also a first timer expecting twins and have to admit, it would be nice to have one of each, although we're not going to find out. There is someone else having twins on this thread, although I don't think she's been on much and can't remember her name (sorry to whoever it is).
Sorry to hear your troubles Sleepy, and I hope the MW put your mind at rest. Just to say that my GP told me paracetamol was safe (I didn't ask, she just used that as an example of something that had lots of anecdotal evidence of safety in pregnancy as opposed to what she was giving me for heartburn which should be fine but she couldn't guarantee it). I think lots of other people on here have been told the same. A lot of drugs in pregnancy are a trade off though- of course you want to protect your baby as much as possible but you need to be well enough to function too.
Jaykay - I've been thinking about the holiday situation here too, as our leave period runs form Jan-Dec (well at the moment it does, may change which will complicate things further) and I wanted to use mine after ML but stagger it, a few days a week, when I go back sometime between Jan and April. As Bumble says, are you allowed to carry any over at all? Was also wondering what would happen if went into labour early (likely for me with twins) and ML was triggered when still supposed to be using hols as would then have been prevented from using hols so may change things. I am going to speak to my boss about it this week but suspect it will come down to HR and they will probably be arsey about it. Their mat policy is really vague, i.e. "leave is accrued during ML" and that's it, and my contract says leave must be used in current year unless off sick, but doesn't mention any other special circumstances. Am hoping it might come down to 'at the discretion of head of dept' or something... Oh, just remembered, I was reading this before, don't know if it's relevant to you or not.