2 week long light-med period ended four days ago. sexual intercourse past three days and now i'm spotting again.my period has never been this long. ?

Irregular bleeding: Irregular bleeding is not an unusual phenomenon among women of childbearing age although it can be confusing for many. Sometimes our hormones are just a bit out of tune some cycles and thus produces periods that are too long, too short, too light, or too heavy, all of the above, or somewhere inbetween. If it continues for many cycles you may want to talk to your doc about it and possible options