Well she did say that she was all over the place.... and well some women ovulate early... (like I think I have ovulated around CD9) and sperm can live for a few days....
But like you said, we would need to know more about her cycle
Unprotected sex can cause pregnancy at any time even during your period lots of womens cycles can go a bit off the odd month and they can ovulate early and once that happens their cycle shortens so i would do a home test or go to a clinic and they can test for you then you would know for sure though saying that sperm can live for up to 7 days after intercourse so you couldve conceived up to a week after sex so it wouldnt show up on a test yet best of luck hope you get the result you want x
Unprotected sex can cause pregnancy at any time even during your period lots of womens cycles can go a bit off the odd month and they can ovulate early and once that happens their cycle shortens so i would do a home test or go to a clinic and they can test for you then you would know for sure though saying that sperm can live for up to 7 days after intercourse so you couldve conceived up to a week after sex so it wouldnt show up on a test yet best of luck hope you get the result you want x