I’m 16 and have irregular mestruation My last period was

Patient: I’m 16 and have irregular mestruation. My last period was on May 13 (day 1 pf period) I had unprotected sex with my boyfriend but used the withdrawal method on the 13th also. My period ended on May 16 or 17. Today, May 22. I have vaginal bleeding but only drops. Am I pregnant?

Symptoms: None