had sex with my bf in my period, pregnant??

Hi, I'm 20 years old. I had sex with my bf in my period. I start to use the pil on the first day of my period,but that was when I already had sex with him, he didn't come in me. I had sex on the first and the second day of my period. My period didn't stop I'm still using the pill. Know I have spotting brown for like 4, 5 days already. My period last for 5 days. Can I be pregnant? My period started day 21