Weird period this month

Hi all! Me and bf had the last intercourse on 28 sep'15. We are quite sexually active and usually he uses condoms but on the last round he didn't but he did not cum or whatsoever. But my period is weird this month. Usually my period is delayed a few days after sex that month but will have it as per normal. This month was very weird i did freaked out. This month's period is quite little but i don't think its spotting since it lasted for a week (my normal period duration) has anyone ever experience this? :-/