ex problems??

So my husband had a successful vasectomy reversal back in August. We're now pregnant with my first baby and his third. His other two are from previous marriage. I'm almost ten weeks so he wanted to tell his kids but before he did that he told his ex wife because he wanted her to find out through him instead of his kids or someone else. To be respectful blah blah blah. Anyways, She flipped out, saying that he's a liar, that he did get a reversal, then he said that he didn't. It just happened. A miracle. He "didn't have the surgery." Should I be bothered that he lied about that? Or just let it go? Honestly our baby is none of her business so I don't know how to feel about it. I can understand why she's upset. I think they tried for a long time before they got a divorce to have another baby but I'm not 100% sure on that, so I can see why it would hurt her to find out that his new wife is pregnant. So maybe he said he didn't get the surgery so it wouldn't hurt her anymore than it already did.  Should I be bothered that he lied to her? When he did have the reversal she knew that he had some kind of surgery, he just told her it was for something else. Maybe he just didn't want to get caught in a lie. I don't know. Hopefully this all makes sense.