וַיָּבֹ֥א אֶל־הָגָ֖ר וַתַּ֑הַר וַתֵּ֙רֶא֙ כִּ֣י הָרָ֔תָה וַתֵּקַ֥ל גְּבִרְתָּ֖הּ בְּעֵינֶֽיהָ׃
아브람이 하갈과 동침하였더니 하갈이 잉태하매 그가 자기의 잉태함을 깨닫고 그 여주인을 멸시한지라
Rashi on Genesis
ויבא אל הגר ותהר AND HE CAME UNTO HAGAR AND SHE CONCEIVED from the first union (Genesis Rabbah 45:4).
Radak on Genesis
ויבא ... ותקל גבירתה, she thought that now that it was clear that Avram's seed would be from her she would become the top ranking wife of Avram. As a result, she refused to carry out instructions given to her by Sarai.