Thank you. I'm worried sick and my bf keeps telling me to calm down but in worried.
I wouldn't worry, because that can mess with your cycles. But a condom breaking does mean that pregnancy can happen. Doesn't matter whether he ejaculated or not - pre ejaculation can still cause pregnancy.
With that being said, you had JUST finished your period, and so chances of conceiving at that stage in your cycle are pretty low. This is because you need to be ovulating to conceive, and ovulation occurs around mid cycle, so the day after your period ending is a bit early for that.
It's still possible, but chances are low so I'd wait and see if your next period shows and if not then take a pregnancy test.