So, in case you missed it, Kim Kardashian recently recorded herself on Snapchat bringing six (yes, six) pregnancy tests into an airplane bathroom. It’s unclear if she took them all, but presumably, she brought that many with her for extra peace of mind.

But…did she need to?

According to Alexandra Sowa, M.D., an internist and clinical instructor of medicine at Weill-Cornell Medical College, pregnancy tests work by detecting human chorionic gonadotropin, a hormone that a fertilized egg releases when it attaches to the uterus. So, when you get a negative pregnancy test result it could mean two things: You’re not pregnant or you’re pregnant and not enough human chorionic gonadotropin has been produced yet.

So, if you get a negative result and want to be extra sure, you can wait a few days and take a second one. But six are definitely not necessary, especially in one sitting.

“Pregnancy tests are very accurate,” says Raegan McDonald-Mosley, M.D., chief medical officer at Planned Parenthood Federation of America. “Most home pregnancy tests work 99 out of 100 times if used after a missed period.” But she also acknowledges it’s possible for a pregnancy test to produce a false negative if it’s taken really early in the pregnancy. That’s why she recommends taking another test in a week if the first comes out negative but you suspect it’s wrong. (You should also obviously make sure the test hasn’t expired.)

Women’s health expert Jennifer Wider, M.D. recommends waiting a week after your missed period, as well as taking the test in the morning, when urine is most concentrated. If you don’t want to wait that long, a blood test taken at your doctor’s office can provide results sooner than a urine test.

So, the verdict? There might be some benefit to taking two pregnancy tests instead of one. But six? Yeah, no.

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