Reb Moshe (E”H, III, 27) addresses the question and cites proof from our Gemora (Kesuvos 10b).
There was a man who came before Rabban Gamliel the Elder and said, “Rebbi, I have had marital relations but did not find any blood.” His wife said, “Rebbi, I am from the Durkati family who does not have either menstrual blood nor virgin blood.” Rabban Gamliel investigated regarding her relatives, and found that she was correct. He said “go and take your purchase (wife, as she indeed was a virgin), praised are you who have merited (a wife) from the house of Durkati.” What does Durkati mean? A cut-off (from these bloods) generation.
Rabbi Chanina said that Rabban Gamliel comforted this man with illogical comfort. This is because Rabbi Chiya taught that just as yeast is good for dough, so is blood is good for a woman (as it causes her to become pregnant quicker).” The Braisa also says in the name of Rabbi Meir that any women who has much blood, has many children.
It is said that Rabbi Yirmiyah bar Aba stated (that the phraseology of go and take your purchase in the case immediately above means) “acquire your purchase,” he said to him. Rabbi Yossi bar Avin says “you are obligated in your purchase,” he said to him. The opinion that he meant “you are obligated in your purchase” is understandable according to the words of Rabbi Chanina (that this wasn’t great as his wife couldn’t have so many children, nor get pregnant quickly). However, according to the opinion that says “acquire,” what kind of meritorious acquisition is this (that he should use a term referring to both acquiring and implying that it is a great merit to do so)? The Gemora answers, that the husband will never have a doubt whether or not his wife is a Nidah.
We see that even according To Rabbi Yosi bar Avin who holds that the absence of blood can prevent a woman from bearing children, nevertheless, the kiddushin is valid, and not regarded as a mistake even though it is detrimental to him.
It is evident that the possibility exists that a woman without blood can give birth, although she will not bear many children. Since she is fit to have children, and many men are not particular to have many children and they are also not particular if she becomes pregnant immediately or not, it is not regarded as a mistaken kiddushin.
In our case, where there are doctors that say that her menstrual cycle will return and she will have the ability to bear many children, the father is not obligated to reveal her blemish to the groom’s family. Reb Moshe adds: The father and the bride should resolve that if four years goes by and she doesn’t become pregnant and she does not begin to menstruate, she should accept her bill of divorce without a hassle and without and monetary claims on the husband.