2 doctors weighed in:

How long does implantation bleeding last? Can it stop & start back? Can it at times be red and only on toilet paper? How long after can I take a test

2 doctors weighed in
Dr. Robert Kwok
Pediatrics
1 doctor agrees

In brief: Test 3 wk after sex

Only 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 a "weird" period.

In brief: Test 3 wk after sex

Only 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 a "weird" period.
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