Possibly Pregnant

Hi everyone. Nervous wreck over here. A couple of weeks ago my partner and I decided to have a few drinks and one thing led to another we had unprotected sex. During the end of October I was expecting my period as it’s normally due around that time. During the last week of October and a bit before then I was experiencing mild period cramps like I normally do and sore breasts, so I was like perfect my period is due any minute...now I’m five days late and still experiencing off and on cramping...could I be pregnant? Or has anyone else experienced this before and their period came eventually?