Bleeding

I came on my period on the 6th and the last day of my period was the 10th. I have had sexual intercourse whilst and after my period. This morning I woke up with a little bit of blood in my pants and a little when I wipe. I've only been off my period 6 days is this normal? I'm worried. 
But I am also wanting to get pregnant, me and my partner are trying. When's the best time to have sex? My periods should be due again on same time next month Or to the end of this month