Announcing to our daughter this weekend

So we are telling our oldest (who is 8) that she is going to have another sibling (her brother is 14.5 mos) and I'm scared to death. Before our rainbow baby (the 14.5 mo old) we miscarried at 8 weeks and a day and I will be 8 weeks next Monday. The reason we aren't waiting is because she's already suspicious about mommy being sick. I haven't had as many symptoms with this pregnancy as I did with my son so of course my anxiety is on overload. My angel baby's pregnancy felt off from the beginning so feeling somewhat normal is kinda of a relief but I would have though by now I'd have more symptoms. My great fear is a silent miscarriage and I don't have another appointment until the 25th of this month. Encouraging words plz? I suffer from really bad anxiety as well so this all doesn't help that.