You had a scan which says im 12 weeks and 4 days pregnant but you didnt have intercourse with your partner until 10 ago does this mean hes not the dad?

Not necessarily. Pregnancy dating is based on the first day of your last menstrual period (LMP), not the date of intercourse. Even if you didn't have intercourse ten days ago, you could still be pregnant if you ovulated earlier than expected. Ovulation can occur anywhere from 10 to 21 days after the start of your LMP, so it's possible that you ovulated ten days ago and had intercourse with your partner shortly after. It is therefore important to speak to your doctor to discuss your pregnancy dating and your concerns about paternity.