Brain Tumor question?

Hi i am 22 years old....My dads sister( my aunt) had a brain tumor when she was about 25....It was benign but very serious....I am so terrified that i will also get a brain tumor...How genetic is it? I also just had a baby 9 months ago ad had a perfect pregnancy...if i had a brain tumor wouldnt it have shown abnormalities in my bloodwork? My husbands friends wife had a pituitary tumor and it caused numerous problems in her pregnancy.....Thanks any feedback would be great!