Okay first of all sorry I'm not a woman as this site is for women so my gf and I had sex as usual on Christmas night around 9pm. the condom broke and my penis went straight through the hole and we didn't know until i finished inside her. Before 11pm she had already taken Plan B. Her first day of her last period was 12/11/16 so she was likely ovulating. She had no side effects and now 1/9/17 which is when she is due for her period she is experiencing light bleeding and heavy cramps (she usually has a heavy period). Is this due to plan b effecting her period or is it implantation bleeding? When should i test her for pregnancy?