Is it possible that i'm spotting 3-4 weeks after conception? this is day two of this odd bleeding, it's rather light and reddish brown. (p10 days late

Can do preg. test: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after a "weird" period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.