What are some other causes?
Pregnancy tests pick up levels of the hormone, hCG, in your urine.
If you get a false positive, you probably don’t have a serious illness.

But that doesn’t mean you’ve taken your test wrong, either.
After a miscarriage or a birth, the hCG levels in your body don’t disappear right away.
Instead, they decline slowly, over a period of four to six weeks and sometimes longer.

Somewhere between 30 and 50 percent of us will experience a chemical pregnancy in our reproductive lifetime.
Many of us will never know we did (viaParents).
Perhaps you’re undergoing fertility treatments.

In that case, some medications with hCG could be used to stimulate ovulation.
Needless to say, this can provoke a false positive pregnancy test (viaOhio Health).
But, according to the Center of Reproductive Medicine, so can certain medications.
Here’s the bottom line: If you get a positive pregnancy test, go see a doctor.