Waiting to tell my husband that we are expecting

My husband and I have been trying for a baby. I'm am so extremely happy that I am 5 weeks pregnant and can't wait to tell him. It's been so hard keeping it from him but we recently lost his brother. I just need to wait until my first ultrasound on dec 1st. I've been panic stricken thinking about the what if's. I can't put my husband through anymore heartache so I have to be sure our beautiful blessing is healthy. Counting down the weeks!