Between all the appointments, blood work, and ultrasounds — to say nothing of the fact that your body feels completely different — in its worst moments, pregnancy can make you feel like a test subject. So it can make sense that some people, given the option of a test, would forgo yet another appointment and lab work. But Cora Bryant, who posts on TikTok as @weylynsmama, is urging all moms-to-be not to skip one very important test.