Babban magana.
a) I think they should go for a secong confirmation test. It is a very heavy discovery, and the outcome can be quite devastating, especially on the girl if she's innocent but they wrongly relied on the first test. As for why the husband failed to notice that she wasn't a virgin, I remember hearing that it is possible for a woman to conceal that. That a way have been devised, using some herbs, medicines, exercises and what have you. So it is difficult for an inexperienced (assuming he is inexperienced

) man to know the difference in that respect. Besides, it is not uncommon for girls to lose their virginity in different ways once they reach certain age.
b) I'm not sure I support that, but knowing our society, I'm not suprised. I believe we've missed one important issue. What was the relationship like prior to the marriage? I mean, ka san akwai irin wannan soyayyar ta unibasiti wadda kar ta san kar ne

Did she present herself to him as this, 'clean, innocent. vituors' girl? Did she promise him, or gave him the impression, expressly or impliedly, that she's a virgin? I know that for most men that is the general expectation and is taken for granted. But there are exceptions, and if the answer to the above questions is negative, then it is unfair for him to turn back and blame the girl. I mean, kowa ya sai rariya ya san zata zubar da ruwa.
c) It is not bad to open up about the true state of your position to your proposed spouse. It is even desirable. It will save lot of headaches in the future.
Since they love each other, they should just carry on. He should consider having a second wife in the future if he so much love to have kids, provided all avenues of curing his wife have been exhausted without a positive result.