Sex help

So my boyfriend and I have been together for 5 years I am 19 and so is he we used to have heaps of sex quite often like everyday but things have changed we have a puppy and he has had a new job for over a month now and we have had the puppy for over 1 month I don’t see why we aren’t having sex I try to give him the Benefit of the doubt and think maybe his new job is on his mind? But there is so many times we could’ve and it didn’t happen, also I feel we are settled and used to puppy now and he seems fine with the new job how can I bring it up in conversation? Without sounding annoying