Could I be pregnant?

So my boyfriend and I had unprotected sex. He didn’t pull out before he began to “finish”. Not all of it went in me, but most of it did. This happened on Saturday, the 29th. My period started 2 weeks ago and ended about 2 or 3 days before this happened. My periods tend to last 4-6 days. I think I was ovulating, as well. Is there a possibility I could be pregnant?