Lack of intimacy during pregnancy?

Does anyone else have an issue with their boyfriend/husband not wanting to have sex, cuddle, spend time together, go on dates, and other intimate things since being pregnant? This is totally not like him. He usually is all over me, never turns me down for sex, and very affectionate. I found I was pregnant December 1st.. That was the last weekend that he's really acted like he wants those things with me. It's really starting to bother me.. Idk what to do.