How to get more aroused during sex?

Im 11 weeks pregnant and me and my husband have sex every night or every other night. I moan and stuff to make him feel im into it. but really my mind is tell me to hurry up and finish already. I have some days where im crazy into it but 85% of the time im not. Hes not small so thats not the issue i know its me cause even when he tries touching on me an stuff im really not into i do it to make him happy, i have a pretty healthy marriage. So we dont have problems. o how do i make my self more into wanting it.