Hi, I'd like to help you with your question.
If there was a major breech of trust, like another woman involved, then your wife is reacting to that and you do have a big issue to deal with. But if your wife is reacting to a situation you lied about that was minor, then the issue is with her.
If you broke the trust in your marriage over an affair or something similar, then you need to regain her trust through a lot of self work. In other words, going to therapy, talking to your wife and basically showing her that you learned from your mistake and that you want to rebuild the trust in the relationship. It may take a while, but the trust can be rebuilt. She is angry now, and getting through to her will be difficult. She needs time to work out her own feelings. Plus, she is vulnerable now with being pregnant and having a very young child to care for. She is most likely overwhelmed and does not have time to think things through.
If your wife's anger is over a minor incident, then the issue may be about her. Does she over react normally to other situations? If so, that may be what this is about. She may need some time to cool down to rethink her reaction.
Which ever reason caused this, therapy for you is a good idea. It shows you are making the effort to fix the situation. It will also give you a place to work out your feelings and support to help you cope.
Here are some other resources to help you:
I Don't Want a Divorce: A 90 Day Guide to Saving Your Marriage by Dr. XXXXX XXXXXe and Dr. William G. Clarke
Fighting for Your Marriage: A Deluxe Revised Edition of the Classic Best-seller for Enhancing Marriage and Preventing Divorce by Howard J. Markman, Scott M. Stanley and Susan L. Blumberg
The Complete Marriage Counselor: Relationship-saving Advice from America's Top 50+ Couples Therapists by Sherry Amatenstein and Tina B. Tessina
Broken Promises, Mended Hearts : Maintaining Trust in Love Relationships by Joel D. Block
You can find these books on Amazon.com or your local library may have them for you.
I hope this has helped you,