Hello. I Am Pregnant At The Moment With Only 13

Hello. I am pregnant at the moment with only 13 weeks to go but now and before I was pregnant I have absolutely no desire or urge to have intercourse, EVER!! What could be wrong with me or what could I do to make this change? I feel so bad for my partner!! Before I was married I used to really want him and have the desire but we weren't allowed to have intercourse before marriage. Why have those desires gone?