Pregnancy announcement gone horribly wrong

Hi all. I am writing this for the sole purpose of receiving support, so please don’t leave any rude comments.

My fiance and I are 25 years old and have been together for over 5 years. I just found out yesterday that we are expecting. I had gotten off my birth control in October and we were not using any form of birth control. He was pulling out but we had many in depth talks about the risks of not using any birth control and in a way we were not trying but not not trying. He had always said that it would be a blessing if we got pregnant, and that he wouldn’t have unprotected sex with me if he was not ready to be a parent.

Our wedding is scheduled for September 2018. We have a very loving and respectful relationship, although we have gone through our share of issues (as any couple has). Both of us have experienced significant trauma throughout our lives and our histories complicate things. We are both in therapy (separately) working on our mental health. We are financially stable and I work 3 jobs while he works 1 job and goes to school full time.

When I shared with him last night that I am pregnant, his reaction was absolutely heart breaking. I am still in shock. He initially reacted by smiling, hugging and kissing me, and crying. He was in shock. A few minutes later, he told me that he has been thinking about breaking up for the last week due to ongoing relationship issues around our communication problems. He said that he would never abandon his child and that me being pregnant changes things but he just wanted to tell me that because he was feeling guilty for having those thoughts.

I have no idea what to think. I was so excited to tell him and absolutely panicked when he shared that with me. I am so scared. I am only four weeks pregnant so have not told anyone, and have absolutely no other support at this time. Thank you for your kindness in advance.