I am so sorry to read this. please except my sympathy.
I too have lost a twin early in pregnancy, and I wasn;t at the time aware. altho, like you, I had signs it was twins with the showing early and strong sickness etc.
I had been for a very early scan due to not having had any periods after having DD3, but knowing I was pregnant. it showed tho a sac outside of my uterus implying a possible eptopic but as it was so early they really were unsure as to how to proceed, but gave me signs and symptoms to watch for and when to return should I get said symptoms.
I was obviously in shock at that point, but was on a 'watch and wait'.
two weeks later, I start to bleed and get the most horrendous pains, plus pains in my shoulder, so get rushed in. when I was scanned however, I was indeed miscarrying, but they could also see a very clear strong heatbeat INSIDE my uterus.......a twin!!
I at that point felt extraordinary sadness for the miscarried twin, but extreme joy that I was in fact still pregnant. It was a very very bittersweet feeling.
I have always comforted myself tho with the thought that had I not miscarried one of my twins, I actually would not have my DS1, as I was involved in a car accident at 28wks where I hit my bump on the steering wheel. It was touch and go to save DS1 at that point, and me too as I broke my ribs and went into prem labour.
I am certain, that had I still been carrying both babies, I would have lost both, so for me, I can look back with yes, sadness, but also some joy as one twin went to save the other. And I do feel that DS1 feels that too as he often mentioned his 'other brother' even before we told him that he had had a twin. I too am sure that his twin would have been a brother for him, even tho the evidence points to them being fraternal due to where they both implanted.
I am sorry to have waffled so long with my own story, but I am now 9yrs on, and I can look back knowing that for me, this all happened in this way for a reason and so I can comfort myself with it...............you may find your reason for this loss too.
I wish you strength at this time. You heart will be heavy for a while, but also happy, which will make you feel so confused. How can you possibly be happy when you are grieving (I had those thoughts). But there is happiness here. you still have a new life to nurture, and one that will carry forward all your hopes and dreams. And also, (I do believe), some of his or her lost twin. I believe it of my son. And I think he does too