Welcome! You'll find people use a nickname on this forum, and that is recommended in the guidelines (link- http://giftedissues.davidsongifted.org/BB/ubbthreads.php/ubb/faq.html)
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Remember that this is a public forum. This is not a diary or a private journal. Try not to post any information that will allow others to identify you, your children, or anyone else. Give enough context so that people reading your posts can offer helpful replies, but be mindful when providing test scores or other detailed information.
To provide anonymity ongoing, you may wish to edit your post to remove details and join the forum again, under a nickname.

Many families enjoy the book "A Parent's Guide to Gifted Children", accompanying them on their gifted journey.

Regarding your specific question as to whether a 3-year-old may not be challenged to potential in preschool, you may find a recent thread interesting which discussed different perspectives on when to let a child lead and set the pace (link- http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/173443/1.html)