Pregnancy tests work as soon as 10 days after UNPROTECTED (damned iPhone) sex.
Plan B can prevent up to 96% of pregnancies when taken within 5 days of unprotected sex. Plan B prevents the release of an egg from the ovary.
Waiting for a “period tracker” is the risky way to determine if you are pregnant with an unwanted pregnancy.
Period trackers are mostly for telling you when you’re ovulating for when you WANT to get pregnant, or for when you don’t want to be on your period while on vacation.
But you can have what appears to be your “normal” spotty period and still be pregnant.
If a person has had either failed birth control or unprotected sex, they should immediately get Plan B, and take a pregnancy test after 10 days. You then have up to 10 weeks (70 days) to use mifepristone or misoprostol.