Praise be to Allah, and peace and blessings be upon the Messenger of Allah. To proceed:
There is no connection between the occurrence of accidents and marriage, and it is not permissible to regard them as a sign that the wife is not suitable for you. This is superstition and an evil omen, which are prohibited in Islam. Misfortunes may be an expiation for sins, a means of raising one's rank, or a test through which Allah tests His servant so that his patience and contentment with Allah's decree may become evident.
Allah, the Exalted, says:
“Perhaps you dislike something while it is good for you, and perhaps you love something while it is bad for you. Allah knows, and you do not know.”
[Al-Baqarah: 216]
Therefore, do not make the accidents that occurred a reason for dissolving the marriage. Rather, put your trust in Allah, perform Istikhārah, and do not pay attention to pessimism or bad omens, because the Prophet ﷺ warned against superstition. It was narrated from him:
“Whoever allows an omen to turn him away from fulfilling his need has committed shirk.”
As for your lack of affection for her after discovering things that you did not previously know, this requires further consideration:
If the reason is a genuine deficiency in her religion or character, you should first advise and guide her. If she responds and improves her conduct, then that is good. But if she persists in disobedience and does not respond to advice, separating from her may be more appropriate.
If your aversion is caused by illusions or pessimism because of the accidents, or by minor matters, or by ordinary disagreements related to the wedding and its preparations, then you should not give in to these feelings. Rather, you should be patient and fear Allah regarding the wife to whom you are already married by contract.
Therefore, you should consider the matter with reason and deliberation, consult people of knowledge and righteousness, increase your supplication and Istikhārah, and think well of Allah, the Exalted.
And Allah, the Exalted, knows best.