Given that Elayne's father did not die until after she was born, I am sure that her concerns with her children having a father will center on his involvement in the parts of their life they remember, which does not look like it will happen. Remember, she still doesn't know about the Cleansing yet, so even setting aside his prophecied death, there is the seeming certainty of his limited life expectancy. I think at this point she's not worried about making sure he's involved in their lives, because it doesn't seem to be possible, regardless of how informed he is.

And then there is the issue that she has no way of making contact with Rand. All the reasons that Aviendha brought up for not going to the Cleansing are still valid. Just because she CAN find him does not mean she should. She has no way of knowing what he is doing at any given time, and her visit could coincide with the next attack by thousands of Trollocs, or his next parlay with the Seanchan or the next surprise ambush by one of the Forsaken. He knows where she is, he knows there generally isn't a lot of action there so it is usually safe to visit discreetly, and she has certain knowledge of his affection for her and thus his willingness to be in her company. Given all of this, the smart and sensible thing for Elayne to do is wait for him to find a good time to visit. Or is it that you people want another excuse to excoriate her for taking "needless" risks?

Besides, she knows/thinks Min is with him, and Min is the one who indirectly told Elayne herself that she was pregnant. Why would she assume he doesn't know already?