Irritable :(

I went off on my fiance this morning because I've been feeling really sick. So sick that I've been missing work, so he's been picking extra hours until hopefully this morning sickness subsides. Because he's been picking up extra hours to support us, I've been feeling very lonely and unsupported emotionally and I guess this morning I just snapped. I feel terribly about it because I know it's just the hormones driving me crazy and he's been nothing but nice to me not once complaining about me working less. I really want to make it up to him but he seems to be keeping his distance now (understandably) and I'm not sure how to sincerely say "sorry, I'm just pregnant!" any advice?