It will be okay honey! I have had many unneutered and unspayed dogs in my home at the same time, with the females in heat(Rescues, and babysitting friends show dogs. I also didn't neuter my Rottie until he was 2 yrs old, and he was around females in heat. Just kept him leashed, or separate.). NO pregnancies. There is a small window of time where a female can get pregnant. Most likely you're fine. If she does end up preggs, okay, just find responsible homes, then you can get her spayed. On the plus side, chis usually have small litters.
Life happens. Good luck!