Can you get fake pregnancy tests?

Paige • 23- UK. Our little pea due November2017 ❤🌈🌞
Iv been buying first response tests from eBay they are about 6.50 for two. I'm just wondering can you get fake pregnancy tests or not? I know first response are sensitive if they are fake could they give a false negative if I do test too early because they aren't as sensitive as real ones. Xq