No matter how LGBTQ-friendly/ally or bisexual your spouse is, your revelation is likely going to cause her to feel unstable and uncertain and to question her own identity in a number of ways. And if you are only three weeks in, it might continue for awhile. The best bet for her would be to find a therapist, preferably one who has dealt with gender issues before, to help her in her own journey. And in the meantime work as hard as you can to strengthen all parts of your relationship, wherever you can improve it. Especially communication. Make sure she doesn't feel like you are keeping secrets from her because one of the initial things is making sure there are no trust issues. Let her help set the pace. If she asks you a question, it is because she is ready to or needs to hear the answer. If you are not out to friends and family, she will benefit from finding people she can talk to: therapist, best friend, people online... PM me if she is looking for others in the same situation.
Good luck! It might be a bumpy ride but at the same time it might bring you closer together 🙂