Implantation bleeding?

I had protected sex on the 9th of May but our condom had snapped. I decided to take a plan b in case, I waited 3 days later since I wasn’t able to get contraceptives earlier where I am. I started my ovulation around the 14th so I had sex and took the plan B outside my fertile window. I have not had sex since then. Today is my last day of ovulation now and I’ve had some spotting. I was just wondering if you guys think it’s a hormonal thing from the plan b or implantation bleeding.