Will someone help me out here?

When I was younger, 16 to be exact, I had cancer. At the time, I was dead set on not wanting any kids and didn't want any of my eggs frozen, if the option would come along. They never said anything about it and any doctor I've been to since, has basically assured me I can't have kids, because the chemo and radiation wrecked my ovaries. I got on birth control just to have regular periods and what not... Fast forward to today, I'm 7 weeks and some odd amount of days pregnant and I'm honestly horrified to tel my partner. I've known for about a month now, but I'm afraid he will think I lied when honestly the chances of me ever having a child were like 1/1,000,000. We've been together for 3 years and never worried about a confirm or anything, and never had any issues. Now that I'm pregnant, I'm honestly so excited and looking forward to meeting my little one in April, but I'm terrified of what my SO is going to do/say when he finds out.
He's joked about it before saying he'd hang himself if I got pregnant (he already has two) or he'd hit me in the stomach so we wouldn't have to worry about raising another one (the mother of the other two is out of the picture and I've helped raise his 2.5 year old and 5 year old). Someone just give me some advice please. I'm so excited, but I feel like me telling him is going to blow up in my face. But I only weigh like 110 pounds and I'm 5'4, so I can't hide it forever...

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