Very typical. Remember, most major symptoms dont start until 6 or 7 weeks. Even so, this is my "rainbow" pregnancy and didnt have a single instance or morning sickness (almost 13 weeks now). I definitely started feeling more tired at 6 or 7 weeks, but if I didnt know I was pregnant I would have blamed it on DS. I am certainly feeling it (the pregnancy) these days.
I know its very hard not to worry. There is a great pregnancy after loss thread if you'd like.