Not feeling excited about this Pregnancy after miscarriage

I am now 6 weeks and 2 days pregnant with all good numbers right now ( hcg 15,600 and progesterone at 7 but starting supplements tonight) and I'm not feeling excited like I should. I have an 8 year old boy and a 2 year old boy that has Williams Syndrome. I had a miscarriage in January of this year and we have been ttc since then. Is it normal to not feel excited when we have been trying for so many months or is there anyone else that may be in the same boat?