What Causes Breast Tenderness And Vaginal Bleeding After Having Unsafe Sex?

my gf had her period on feb 13. we had sex with a condom on the 20th but the condom burst. she took positnor 2 couple hours after (4-6 hrs) but she only took 1. The next 12 hrs she took the 2nd pill but had unprotected sex right after. she experienced breast tenderness and vaginal bleeding after urine two weeks after. Is there a possibility that she is pregnant?