It's just another day. Really it is! It's 24 hours and your baby is none the wiser that tomorrow is anything special
Or the day after that. Or the day after that maybe

It's just a date, and an estimation at that. Don't focus on it and just do what you always do. Less than 5% of babies come on their EDD. And I reckon about 70% of the first time mums I work with go at least a few days beyond their EDD. Best advice is not to get hung up on it. It will happen when it happens, anytime between 38-42 weeks. An estimated due MONTH would be much kinder to us I think!