So sorry to hear of your loss Ascr. I think it can be very hard for people to understand how distressing it can be to go through this if they haven't experienced it themselves.
As previous posters have said, it would be very helpful to talk to your GP. They might be able to refer you for counselling free of charge. I have not ever had counselling before, but i am looking into it at the moment as i think i (and maybe my partner) could benefit. Also, depending on your locality, some organisations specialise in counselling relating to miscarriage, and offer very good rates depending on your personal cirumstances - maybe you could have a quick internet search.
I wish there was some advice out there on how to deal with other people who are pregnant. Its just so hard, sometimes you can avoid meeting them if you feel particularly vulnerable, but you cant just hid away either. I tend to be quiet open, though at the same time dont go around announcing that i feel rubbish... It's hard to know what to do. The thing is i am happy for them, but also very sad for myself, it's just very hard.
I dont think you mention you partner in your post. Can you talk to him about how you feel? It can be a relief just to let him know how you feel even if he cant provide any answers..
If you have had one miscarriage, the chances are that you will go on to have a successful pregnancy the next time - most people do - so don't lose hope in that.
SO maybe try to give yourself time to be sad; then if possible put it aside and do something nice with your partner and little one.. It is important to find an outlet for your sadness and anger though (which is where counselling will should help); otherwise it can be overwhelming - so maybe focus on that first, and then when you are ready try to identify some things you enjoy doing, that might life your spirits..
Very best of luck.