וַיִּשְׁמַ֥ע אֱלֹהִ֖ים אֶל־לֵאָ֑ה וַתַּ֛הַר וַתֵּ֥לֶד לְיַעֲקֹ֖ב בֵּ֥ן חֲמִישִֽׁי׃
און גאָט האָט צוגעהערט צו לאהן, און זי איז טראָגעדיק געװאָרן, און האָט יעקבן געבאָרן אַ פֿינפֿטן זון.
Or HaChaim
Leah may also have walked towards her husband in order not to have to call him to her after Jacob had already entered Rachel's tent. This would have been an embarassment for her sister Rachel. It might have resulted in open jealousy. Leah's virtuous considerations therefore outweighed the unconventional manner of her behaviour. It is clear that G'd appreciated this as He rewarded her by letting her conceive; the Torah wrote: "G'd listened to Leah and she conceived." Look at my commentary on that verse
Rashi
כי גם זה FOR THIS ALSO — also means additional to you, over and above Joseph. Our Rabbis explained that with each of Jacob’s sons a twin-sister was born, whilst with Benjamin an additional twin sister was born (Genesis Rabbah 82:8).
Ibn Ezra
This time I will praise. After having borne four sons. Because Leah was content with this number, she stopped giving birth.