Pregnant sex

Before I got pregnant me and my boyfriend had sex a LOT we had our own apartment it was exciting and new for us since I had moved to another state for college .. anyways now that I'm pregnant I don't even get horny anymore I could really care less about sex , my first trimester we did it a lot still because I didn't know I was pregnant but after that I just feel like I don't feel the urge to have sex anymore and he does all the time basically. Then he will get mad at me for not being in the mood and I'm the bad guy