Is a wife entitled to prevent her husband from intimacy after she has given herself to him—and the marriage was concluded by reciting the Fatiha in the presence of the guardian and witnesses, and the dowry was taken—due to her pain and fear of pregnancy?

Entry is permissible after the marriage contract, and what you did is not forbidden and there is nothing against you in it.

You are not permitted to refuse intimacy with your husband if he provides you with suitable conditions. Scholars have stipulated that if a woman willingly enables her husband, she is not permitted to refuse him if her prompt dowry has been paid.