Why Is My Partner Sending Mixed Signals About Our Sex Life?

About to rant here for a second...

So, since about 8 weeks preggers my SO and I haven't had sex. For a while I was tired all the time...and then I started getting all the body aches and pains and weird pelvic pressures that make the idea of being intimate unappealing. I'm now 17 weeks, I'm still always tired, my back and hips always hurt...and I work evenings so by the time I get home he's had a few beers and that's not always the best time for activities...and I don't want to taste leftover beer during kisses. Well, last week I brought up our lack of a sex life. I feel bad because I'm not taking care of him. He says it's no big deal and hes accepted it. I found SO much relief in that...like ok, at least with all the lovely body changes and emotional stresses that come with pregnancy...that's one less thing to stress about. WELL...today an hour before I'm leaving for work he texts me and wants to talk about sex and how it's been on his mind so much lately. I'm just sitting here like baffled and crying like didn't we just talk about this?? Said one thing and now saying something different. Uuugh...am I in the wrong to be upset and confused right now?

Ok rant over.