Second pregnancy after about 10 years!

I am 30 years old and this week we just found out that I am pregnant. I have a daughter who will be 9 in June, so this is my second pregnancy about 10 years later! My due date right now is 12/22/17. They are estimating me at about 5 weeks right now. I have my first appointment and ultrasound on May 9th, so due date could change a little. I am feeling so nervous about this pregnancy as I am older and already have a child. I know my daughter will be a big help but am starting to feel guilty about not being only "her" mom. I know, that's silly! I am also having nervousness about delivering in December around the holidays as it is such a busy time for me and my family already, and don't want to take away from my daughter's holiday and Christmas experience, as it's something she looks very forward to every year. I know this situation is only this one year and probably won't ever happen again like this but I am just feeling very anxious about a lot of things right now. My husband and I went off the pill in mid-March to try for a baby and became pregnant rather quickly. I was shocked! Anyway, I just need to get my worries out a little right now. I know everything will change, but change is scary for me. Trying to chant the "every little thing is going to be alright" tune over and over. Thank you for listening!