Congratulations. I know the fear of the unknown well, but I promise you that you'll get through this with a smile at the end.
I found out I was expecting twins at my 12 week scan but it was my 3rd pregnancy, not my 1st, so our long-debated 3rd and final child suddenly became two more!
They thought my twins had originally had separate placentas which had fused together, but couldn't be certain. They were also in separate sacs. (Although they turned out to be identical - just in case anyone tells you that yours def aren't identical - they still could be.)
I carried on as normal with my regular MW care in the community until 24 weeks. At 20 weeks I had my regular second scan in the regular scanning department - just like with my other pregnancies. The only difference was that it took forever because there were two sets of measurements and one baby wasn't being cooperative - it lasted almost an hour and a half!
My first meeting with the consultant was at 24 weeks and I was told that although all twin pregnancies are considered high risk, mine wasn't particularly high risk because they were in separate sacs.
I was seen every 4 weeks up to 32weeks and then every 2 weeks after that. I didn't have appointments with my community MW after 16 weeks, but I still had her contact details and was told to contact her for any minor questions or queries. (She ended up coming out to check me out after I fainted in the shower one day.)
I was surprised and frustrated in a way at how laid back they were about it all - until 24 weeks there was no difference at all between my twin pregnancy and my first two singleton ones, yet I had a million and one questions going round my head and it felt totally different to me.
Less fuss or intervention by the hospital is a good thing, but it felt weird to me.
Any questions just ask - or pop over to the multiple births section and you'll find lots of us twin mums over there