Making love... Feel like he isn't as interested

We only seem to make love once a week... I try to initiate but he often says he is tired or not up to it. We have been TTC for 8 months. When I am ovulating, he is always up for it.  However, I don't just want to make love for that reason, having a baby is our focus but I want our emotional and physical closeness to come first. 
Any advice, opinions...