Spotting am I pregnant?

Wendy

This last Friday I had intercourse for the first time in the last ten months. We just did it one time. It is the 21st day in my cycle. It was unprotected and today I started spotting. My legs feel super heavy and I’ve been cramping mildly since yesterday. My lower abdomen has been pretty noisy and I’ve been going to the bathroom pretty constantly. My period is supposed to start on Sunday. Is there a possibility that I could be pregnant?