Is it normal to have crazy mood swings and sadness one week before delivery?

I believe it’s a very valid and emotional response to a major change in your life. I found from about 3 weeks away from my scheduled c-section my mood became abit unpredictable and would’ve cried at the smallest things. I think it was a sense of grieving the natural birth I originally envisioned and thought I would have had, a mixture of nerves and anxiety about major surgery and also “grieving” the last few weeks of it being just my husband and I