In Theresa Raquin, p. 122 it says she got pregnant 5 months after getting married and Laurent kicked her until she had a miscarriage. Wasn't is stated that they could never touch each other again?

The text states that the child was Laurent's.

From the text:

Therese had a bad fright about five months after her marriage to Laurent. She found out she was pregnant and detested the thought of having a child of Laurent’s. She had the fear that she would give birth to a drowned body. She thought that she could feel inside herself a soft, decomposing corpse. No matter what, she had to rid herself of this child. She did not tell Laurent. One day she cruelly provoked him and turned her stomach towards him, hoping to receive a kick. He kicked her and she let him go on kicking her in the stomach until she thought she would die. The next day her wish was fulfilled and she had a miscarriage.