Pregnant ?

So I had sex with my girl 2 days after her period ended but the condom broke mid sección and I did in fact came inside , my concern is she took a plan b 30 min later but then 9 days later she started bleeding dark/brown blood and it’s been 2 days and she still bleeding I try to look on google and it’s says implantation bleeding now I’m scared someone help pls tell me is not 😔