Don’t know what to do!!!!

I’ve have just found out I am pregnant 5+ weeks. I am happy but in the back of mind I do have doubts. We have 2 girls age 10 and 9 and a little boy age 18 months. At the beginning of the year I had an abortion (don’t judge) we wasn’t in a good place and I couldn’t bring another baby into a horrible situation of arguing all the time and it being nasty. We both agreed at the time it wasn’t the right time. I hated my other kids around it. But now we are sooo good I mean better than ever. We have been threw so much in our time together. But he constantly saying can’t cope with anymore kids. I’m so scared that if I tell him he will leave or he will be like have an abortion (I can’t go threw is all again) I don’t want it to make things bad but I am happy. What would you do if you was in my situation??? I’m sooo scared to actually tell people.