Ok. Because I've heard this from many pregnant women and have also felt this myself. Partners in pregnancy, heed my words. There are a few things you can do to ensure that she will not fly into hysterics and begin crying.
1) Hug her every single day and tell her that you love her and she looks pretty. Although pregnant women are beautiful, they don't feel beautiful. They are getting bigger and bigger and they are getting stretch marks and they are tired. They feel ugly at times.
2) When she says there is something that needs updating or fixing in the house. Just do it. Whether you agree with her or not. Just do it. You will save yourself a lot of heartache.
3) If you don't care about feeling the baby move, lie to her and put your hand on her tummy when she asks you too. It's important to her to share the babies movements with you.
4) Make an effort to learn what is going on with her body and her emotions. And also what you should expect as the partner.
Ummm...this is all I can think of for now. But trust me. Women are complex creatures anyway. And pregnancy intensifies her feelings and her dependency on you. It may frustrate you sometimes, but try to remember what she is going through. You aren't going through it. So just try to be patient and supportive. Okay? Good Luck!