Very little time for intimacy

My husband and I have been together for 6 years. We have been trying to get pregnant for a little over a year now. We have always only had sex a few times a month. Neither of us has ever had a lot of sex drive. We are both very happy in the relationship and sex life. So trying to make sure we are having sex more often without it feeling forced has been a struggle. Within the last month his work schedule has changed so we are only home for about 2 hours if we are lucky together each night when I get home from work and before he goes to work. And now my 20 year old brother is living with us and it seems like he is always home in that short amount of time my husband and I have together. I am a very private person and don't like to talk about anything like this with other people nor do i want them to know what happens in my bedroom especially my brother! How do I spice things up with my husband but still be discrete so my brother doesn't know?