Period short

So this month my period was only three days but weird started on the 25 light, then on the 26 was medium on the 27 it stop, me and my husband had sex that day then adter we had sex i started spotting again light then later on we had sex again well we pretty much very active this morning when to the bathroom and was normal nothing when I wipe myself but later on when I went I had browns spotting never had this before anyone knows????