Can you get two false positives in a row with 2 different brands?

Tatiana • Married since 2009, with two amazing daughters.
Got two BFPs this morning, but I feel like it had to be wrong bc we've been doing withdrawal method for contraception and there have been no accidents. Don't get me wrong I'm thrilled of its true. But I feel like a giant fraud telling everyone...is it possible that they're false positives????