Desperate need of advice!!!

Amber
My husband and I have been married a little less than a year and we are TTC #1 for me 2 for him. He works offshore and is gone for 3 weeks and home for 3 weeks. We have his son the entire time he is home which I love. The problem is we get absolutely no alone time and I don't want to push the issue and make him think I don't want to spend time with his son. I have to be at work at 5:30 in the morning and don't get home until usually around 5 pm. So his son is home when I get home and I stay up until around 10:30 or 11 to spend time with my husband. Well since school is out he doesn't come to bed until I am asleep. This makes it difficult to grow our family. I've tried talking to him and he did good for about a month and don't know what else to do. Sorry it's so long winded but I need HELP!!!