The Almost Famous star announced she was expecting her first child with Bellamy in January, 2011 and the Hollywood beauty admits it was a stressful time for the new couple.
She tells Britain's Elle magazine, "It was all very old-fashioned and proper and we went on lovely dates, but two months later I was pregnant. I was shocked, but I also thought: 'This is going to be interesting.' I knew it would take a strong man to deal with it.
"You know that with a relationship things can go either way when you have a child. When you get pregnant everything changes; you, your body. Everything becomes a big decision, but he was there and that was that."
The pair became engaged three months later and that summer (Jul11) Hudson, who also has a nine-year-old boy with ex-husband Chris Robinson, gave birth to a son, Bingham - and the couple is still together.
She adds, "Now it's three wonderful years later. Things happen for a reason."
Hudson insists her relationship with Bellamy is stronger than ever, but they likely won't wed in the near future: "We will get married. I do think it's important but we have no plans. Ryder wants a party."