3 doctors weighed in:

I had a 4 day period. A week later I had two day spotting. Is this implantation bleeding?

3 doctors weighed in
Dr. Robert Kwok
Pediatrics
2 doctors agree

In brief: A person can't tell

Wait. A positive pregnancy test can tell a woman that prior spotting was actually implantation spotting.
It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period.

In brief: A person can't tell

Wait. A positive pregnancy test can tell a woman that prior spotting was actually implantation spotting.
It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period.
Dr. Robert Kwok
Dr. Robert Kwok
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