Why do I feel this way?

So I'm 10 weeks, and my fiancé works all the time and when he is home he sleeps due to working third shift and I work 2nd shift, But when I come home at night and he is not here it makes me feel like we are really distant and I feel alone and will cry myself to sleep, not sure if it's just the hormones or if I am feeling depressed. It's really starting to take a tole on our relationship, does anyone else feel like this due to being pregnant !!? If so any suggestions on how to make it better...