Hi ladies, welcome welcome 
Blue not sure if this will help but I remember being achy around my bump/lower back pretty much all the way through with DS. If you are worried though give your midwife a call. Its what they are there for, don't hold back because you think you'll be bothering them unnecessarily just have a chat to them then hopefully you'll be able to relax.
Just a thought but have you had a Health and Safety assessment at work now that you are pg? You should have had a couple by now I think - reason I ask is that I remember that I had my chair height/monitor height adjusted to make sure I wasn't working with bad posture and it did actually make a difference with the general aches and pains.
Bauble so sorry to hear your story, but you are very welcome here. Please do be kind to yourself and allow yourself to feel whatever you feel. We'll be here for you
Re vitamins, I think what is in the pregnancy vits is pretty much what is in the pre-conception ones (could be wrong though, check the labels) I know that you can take Pregnacare before, during and after pg.
Pie 11 weeks, wow! hooray! I think it is entirely natural to continue with the metalling, but don't worry feel free to vent your worries here and hopefully you'll relax a bit in RL 
Far and Pie I am actually feeling much better on the Metformin - nausea has gone and apart from a few crampy pains last night (sort of like trapped wind, and probably actually...urm...was) and a washed out feeling all is well thank goodness.
As far as ovulation is concerned, I have had lots of EWCM for the past couple of days so I am hoping it will be soon. I am CD21 today, consultant reckoned about CD20 now I am on the meds. I am still temping so I am awaiting the rise.
Actually something rather interesting has happened with regard to my temps (apologies to those who don't chart - this won't mean much) - pre ovulation my temp was between 35.8 and 36 with post O being 36.1-36.6. After taking the Metformin my pre-O temps are all above 36, average around 36.2 ish. Not sure why this would happen, anyone have any ideas? It started happening the day after my first day on it so pretty convinced its due to that... 
Ooooh, IQ enjoy the scan! Let us know how you get on 