how to tell my husband I'm pregnant with baby number 3

So my husband and I already have 2 kids. I just started working as an STNA a couple months ago, while my husband finishes up school. He probably has about a year left. I just found out I am pregnant with baby #3 and I'm not sure how to tell him. I want him to finish school but he is the type of guy who wants me to relax and not work while I'm pregnant... How do I tell him??? My birth control prescription just ran out last month. And we were kinda like, if it happens it happens. But I was stupid and didn't think it would happen so quickly... 3 of my friends said they had a dream I was pregnant, and my daughter today said "I don't wanna hurt the baby in your belly" and I didn't even know until later on after I bought a test. I'm just worried he's gonna get stressed out and worried about everything. Help please 😘