I felt the same way. I always wanted 3 children. DH only wanted one at first but agreed to 2. We had fertility treatment to assist with getting pregnant with DS1 (Hormone injections) and DS2 (clomid) and i refused to let dh get the snip after #2. I don't think he was THAT against a third, he has always given me what i want. I wanted 3. I did not feel our family was complete after 2. I fell pregnant naturally with DS3. I was thrilled, DH, not so much. But he accepted it. He occasionally says he wishes we stopped at 2 (usually when talking about finances) but he adores our 3rd boy... DS's personality certainly is very lovable!
Since he was born, even though i still long for a daughter, i feel my family is 100% complete.