What should I have engraved on the ring I bought my wife for her 30th birthday?

I am not much of a romantic so I need help with this. I’m 28 and my wife turns 30 next month. She is currently heavily pregnant with twins – our first children. They will be born before her birthday. I have bought a sapphire ring as a present and I’m thinking of having something engraved to mark the occasion(s). The only problem is I don’t know what to write. It has to be short of course. Any suggestions? An appropriate saying, motto or quote?