As the dad you're probably blissfully unaware of the microscopic changes that are taking place in mom's body until she makes the big pregnancy announcement. Though you might also be the type of dad who actually helps her take the pregnancy test. No matter where you fall in the mix, be sure that you put forth a supportive effort, even if you're a bit shocked yourself.
At the end of this month, just as the pregnancy tests are turning positive and she's missed her first period, your baby is about the size of the eye on the King of Hearts. Isn't it amazing how something so small can bring about such change?