What should I do?

I found out I am pregnant with baby #4 on the 2/4/18. It was a bit of a shock as I was tracking my ovulation and we didn't have sex during my fertile week. I am happy and see this pregnancy as meant to be. My partner and I have been together for 12 years ( Anniversary sex made me pregnant). He recently lost his job so he is down right now because he can not provide for us the way he wants to. I had a talk with him to see where his mind is in regards to having another baby and he wants another child he just doesn't think right now is the best time due to him not working. At the moment I have been a stay at home mom as I have a 19month old. But I've been trying to find a job to ease the stress on him. I don't know how to tell him and I hate keeping this from him. What do I do??