Finally a BFP!

My husband and I have been TTC for 3 years. We found out two years ago that he has azoospermia(absence of sperm) because he had cancer twice when he was younger and the chemo side effects kept him from producing any sperm. We went the route of sperm donation and have had 2 failed IUI's. I was sure the third was also a failure, but yesterday I got a BFP on day 12 post IUI. I'm 3.5 weeks along and I am soooo nervous it won't stick! I want to be excited, but I'm afraid of being TOO excited. Anyone else going through this?! ?