Excited and scared

Had my first ever miscarriage this past July. We were devastated. My kids took it hard too. I found out on the 6th (8dpo) that I am now pregnant with my rainbow baby. I am so happy but so scared. I'm planning on announcing it to my husband on Christmas through a gift. I just don't know how to feel. I'm so worried and just don't want to go through a miscarriage again. It took us 4 years for that one and we lost our baby at 10 weeks. I just don't want to get my hopes up in case but I am so excited at the same time. I'm only 4 weeks and 5 days today and am hoping this one stays. The funny thing is I have 2 kids already with August birthdays, and now this one is due August 21st :)