Pregnant?

So my boyfriend and I had sex for the first time on May 5th, which is also the day that my period ended. It stopped that morning. I had been on the pill for a month, he used a condom and he didn’t even ejaculate from sex. He pulled out, took the condom off and then I gave him a blowjob until he came onto my stomach. Ten days later, I’m now spotting. What does this mean? Why am I spotting ten days after my period ended? Am I pregnant? Is that even a possibility?