Is anyone else anxious about having a baby?

I've been really uneasy today. I keep having thoughts like "What if I'm not ready" and "Should we have waited?". We are happily married. I just keep feeling like we messed up. I've been more than thrilled, I think I'm just really anxious today. My husband is about 2 hours away for a clinical rotation and maybe our separation is causing these feelings? We still spend weekends together, so that's good. There is literally no reason for me to feel this way but I can't relax and I don't want my husband to think I regret pregnancy. I honestly do not. I was just curious if anyone other expecting mommas get really anxious and have second thoughts here and there. Again, I do want this child and I cannot wait to be a mom. Maybe I am just having an off day.🙁