Congratulations!
Am a few weeks ahead of you (14+3) so I'm pretty new to it all but just going with the flow.
What I did (after asking the lovely ladies on mumsnet!) :
5 weeks : saw a gyne (a new one picked randomly because she was close to where I live). She examined me and gave me a prescription for blood tests to confirm the pregnancy and test whether I'm immune to toxoplasmos
Next day : got blood/urine tests done & booked 12 week scan
Next day : booked in at a maternity unit. My gyne had scared me by saying how they get full very quickly (am in Paris)
12 weeks : did scan
That day : saw gyne who gave me a prescription for more blood tests (am not immune to toxoplasmos so have to be tested every month) and also for the blood test associated with the nucal measure thingy (for down's syndrom, can't remember the name in English)
Next day : blood/urine tests
That week : sent off the forms my gyne had given me : one set to the CAF and one set to CPAM (medical centre) confirming my pregnancy. I also told my employer that I'm pregnant (with photocopy of the official forms). Turns out you really don't need to do that, but never mind!
16 weeks : will return to see my gyne for check up and prescription for blood tests.
Was also advised to start looking for a creche/nanny but that may also be because I'm in Paris.
Vitamins : I take the Gallia pregnant women vitamins because it contains lots of vitamins, folic acid but also DHA which is not in all the brands (you take 2 capsules per day). Not on prescription but over the counter.
snap my gyne bascially said the date that the maternite gave me was my "last possible giving birth date"
which is effectively 41 weeks.