Less sex?

It’s probably me over thinking, but is it normal for sex to die down when you get into a relationship? We went from doing it 2-4 times a day to then about 3 times a week, now for the last almost month I’m lucky if we do it once a week. We’ve only been together for 2 months now, I thought the sex would last longer b4 it got down to only about once a week. An we spend a lot of time together too, most nights I stay the night an just the other week I was over for a whole week and again, we only did it once. I’m kind of starting to think maybe it’s me or some I did, or is he losing interest 😕