Neglected 6 year old????

I'm 8 weeks pregnant and for the last two weeks I've been exhausted and nauseated ALL DAY!!! I have a 6 year old and I feel like I'm not doing anything with her. Last year we went to the pumpkin patch, carved pumpkins and decorated the house for Halloween. This year I haven't done anything, I haven't even taken her to the store to pick a costume. I feel like such a horrible mom. My husband works out if town and is only around on the weekends. Between work and doing it all by myself during the week I have no energy on the weekends. I'm so sad and I fear that she feels neglected. She's so important to me, I don't want her to ever feel like that.