I think a Cattle Dog just Mated with my Pure Breed Staffy on heat day 13 - Help?

If i abort will this affect her pure breeding??? How early can i abort? Is there anything else i can do. Its her second heat but she is a tiny little staffy and the pure breed red cattle (that she just ran off with in the dark (250 acres) couldnot find her.) WHAT WILL I DO??? HELP PLS. Iwanted to breed her. i hav 5 pups if pure sold aready.. AARRHHHH