Bleeding but not period?

Hello! I just want to know what's going on, never happened before. Today I started ovulating, but I also started bleeding. My period ended about a week ago.
It's not heavy bleeding, just spotting a bit. I have recently had sex without a condom(stupid on both parts) he did pull out and finished off with a handjob. I don't feel any cramping. Just headaches and a bit of dizziness every now and then since my fiancé and I had sex. I'm a bit worried. This never happened before. Advice?