What is external pregnancy, is there such a thing?

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Best information and tips about help for pregnant women, help with pregnancy and pregnancy help
I took my cat to the vet today to see why she is in heat so soon after being mated recently. He told me that her last mating resulted in an external pregnancy and that her current heat is a false one. What does this mean? Is this possible?
What are te causes? And what should I do?

it’s a pregnancy outside of the uterus