Confused? Spotting?

So I stopped my birth control 2 weeks and had a scheduled period that last week of my pill pack. My period ended on Saturday (5 days ago). My hubs and I had sex Tuesday. I had light spotting this morning. Nothing else really through the rest of today. Is this ovulation? A withdrawal bleed? Implantation (not sure if that's even possible 5 days after your period?) anyone ever experience this or know what this means? Thanks ladies!