if it was the 10th march then i calculate that you are 6 weeks pregnant and that (working on a cycle of 28 days) you are due around the 15th December!
Heres a little messageboard group you may like to join or just lurk
http://messageboards.ivillage.co.uk/iv-ukpbdec 2009 they are a great source of help and info and Ive been on mine for 4.5 years now.
dont worry about work so much just yet. Your first appoinments arent too often, usually every 6 weeks with blood tests at 8 and 16 weeks and a scan at 12 and 20 weeks.
You have to be allowed time off for appointments though if i a different town you may have to take half a day, speak to your employer as soon as you want to so that a risk assessment can be made of your job too, though ask them to keep it confidential if you dont want colleagues knowing.
theres loads of great ladies on AB who will give you lots of info too.