My wife (36) is planning to get a breast cancer screening, and I (34) don't want her to

What can I say; I've had cancer (leukemia) in my family, and I'm afraid of what she might find. We've talked about this, and I told her I would prefer she didn't do a screening, but she's adamant about getting one anyway. I'm a mess right now, and I don't know what to do. She could be fine, but what if she isn't?<br><br>&#x200B;<br><br>I can't sleep now, and I'm so anxious and lost. How can I convince her to skip this screening?