I had unprotected intercourse with my gf at the last day of her period (26th nov).. She took emergency contraceptive pill 2 days later(28th nov).. And then bleeding started one week after taking the pill (5th dec), which lasted 3 days (8th dec).. And she hasnt had her period since.. Its 13th jan already.. Is this the sign that she is pregnant?? And is the bleeding that she got after week of intercourse implantation bleeding???