Hi Kaitlyn,  I found this on one of the older posts.  I just searched "pregnancy" and found it.

" Can women get pregnant with moyamoya?
    There are no pregnancy restrictions after surgical revascularization to treat moyamoya. Patients are asked to stay on their aspirin, and to have their obstetrician work with our team to ensure open communication is maintained. There are no specific restrictions for labor and delivery. Normal vaginal delivery is fine when considering the history of moyamoya."

I had my daughter a year after the surgeries and she came out fine (other than being a little diva ).  The docs did not want me to have natural birth due to the pushing involved and how that may be a strain on my condition.  Because the condition was so rare, and no one in San Antonio, TX could treat it or even knew anything about it, when I had to go in for emergency c section due to Clampsia (having a seizure related to high blood pressure I have had all of my life) the doctor chose to induce a coma (because of the seizure).  Had I listened to my OBGYN and started bedrest two weeks earlier, then the coma thing would have never happened.  I hope this helps.