According to Giovanna (a multiple abductee), this isn't the first time. She's been not only impregnated before, but has been getting the usual abductee testing done on her since the age of 4. Giovanna made claims of a phosphorescent residue left on her body as "something they use as a disinfectant" that they implored after taking blood and tissue samples and inserting implants into her.
Her testimony seems pretty hard to swallow, but from what I can gather, there's scientific evidence to back all of it up. The implants and the glowing goo have all been analyzed and have come up positive for we-have-no-idea.
I have a feeling we haven't heard the last of Giovanna. When I hear more, so will you.