Need some advice or validation

I am a 25 (F) and my husband is 35 (M). Im currently expecting our first and as such my hormones have been going wild. Now I should preface I've always had a high sex drive and my husbands is low. We still try spend time together but its always agreed upon (usually once or twice a week) but often we have long dry spells. He'll have a reason each time, tiredz, headache, not feeling it. Its driving me mad. Usually in media the guys are portrayed as sexed up hounds and its the women who aren't interested but our situation is reversed. My pregnancy is making me absolutely crazy horny and he's not as interested as I'd hoped. He is happy to be a dad and other he's a good husband there are just small things like this that have been a long running issue in our relationship. I'm so tired and Ive tried everything I can think of. Anyone else having similar problems? This is not the only issue but its causing the most problems by far and I just at least want to know I'm not alone.