Spotting after sex?

Courtney • 33.. Mother of three.. Trying for #4! :)
My husband was out of town for a couple of weeks so I went two weeks without sex.. After doing it I had dark brown spotting for several hours.. Anyone have this happen after going without for a couple of weeks? This happened 8 days.. Due to start tomorrow.. I don't think I'm pregnant.. Just wondering if anyone has had this happen after not having sex for a while?