Faint line. Line or faint positive?

Had my periods from the 7th of December to 10th of December and intercourse on 13th December and the condom broke. Had unwanted 72 on that very day. My cycle ranges from 25-29days.Is there any chance of pregnancy? I bled from 4th January this month but the flow was very light. On 6th January bleeding was medium and also passed few clots. And today that is, on 7th the bleeding has stopped. Is there any chance of pregnancy?  Can the pill make your periods lighter? I took a test on 2nd January with afternoon urine and it came out negative but when I looked at the kit again the next day it had a faint line. The picture is attached. Could u please tell me if it's an evaporation line or faint positive? I again took test on 3rd January and it was negative