Sex advice

I am 23 weeks pregnant and it has only been in the past 3 weeks that I have gotten my sex drive back. My husband and I went about 3 months without sex. Not that I would deny him, but I guess he didn't want to push sex on me because he noticed how tired I always seemed to be. Well, now my sex drive is back, and all I want to do is jump on top of him. But he has picked up more hours at work, so now he's tired all the time. We had sex the other night for the first time in a while, and he didn't last very long because it had been so long. And it was late at night, so we didn't attempt again. Needless to say, it was short lived so it was good while it lasted, but I still didn't get my needs met. And I don't know if it is this way for anyone else, but at 23 weeks, maintenance down there doesn't happen as often as I'd like because bending over is difficult and getting it done is equivalent to running a marathon. So I'd like to get as much in as possible before it becomes a forest again. And I feel really bad pressuring him for sex because there is so much going on right now. It totally makes sense that he isn't as desperste as I am. Advice?