Why isn't he interested in having sex

Amanda • Married for 6 years. 2 year old miracle baby girl. Expecting baby #2 in February 2017!
So my husband and I have been married for almost 6 years. We have a beautiful little girl who turns 2 in January. We are currently ttc. Even before I got my iud out and started ttc he never wanted to have sex. I have tried everything. Lingerie, showering together, porn, candles, music. Everything that I can think of and it doesn't effect him. If I don't ignitiate it it wouldn't happen ever! Now even when I do try to he always has an excuse it seems like. He says he's tired. He would rather play on his xbox then have sex with me. Yes we are ttc but we don't make a big deal out of it cause we don't want the pressure or to make sex feel like a chore. I don't understand what I am doing wrong. He apoligizes but after getting turned down for months it's starting to hurt. What do I do? Any advice? I have tried to talk to him about it but it doesn't do any good. He doesn't even act like it turns him on when I try to look sexy. He won't stare at me or me catch him looking at me. It's just like you look nice. I feel bad cause I'm tired. Please don't be upset with me. What do I do? I'm almost to the point that I don't even want to try to get him to have sex with me anymore cause when I am turned down it hurts me and it's always the same thing. I've asked if he isn't attracted not me anymore and he says he is but ifk. Any advice?