A negative test is definitive 21 days after sex. Get a few cheap red dye tests and take them leading up to 21 days and then after 21 days. They’re FDA regulated, so anything will meet accuracy standards, even a $1 test. Note that ovulation is what sets the “countdown” to your period. If your period is late and it’s not pregnancy, you ovulated late. Period tracker apps don’t know when you really ovulated.
i took a test when my period was a week late according to my app but i also have an irregular cycle, so i waited a few more days and took another test, both were negative so i thought i was fine but this has me second guessing. i never got my period last month but this month i def had symptoms of ovulation, and lately my sleep and overall health has been very bad so i attributed that to the reason i skipped a period. after reading this im so stressed im pregnant 😭😭