So I had sex with my girlfriend 2 days into her period and i used a condom but it slipped off and I'm not sure when it did and if sperm got came out.
But her period usually last 3-5 days and its been extended to around 2 weeks now.
Also she was a virgin about a week and a half before this and i popped her cherry by fingering her and then we had sex about a week after this.
Could she be pregnant or could it be because she just lost her virginity or the sex caused this?

just some other info, shes 16 and has had her since she was 14