How long does it take after conception for pregnancy to show on a blood test?

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I have been on the depo shot so I have’nt had a period in a while. I want to go take a blood test because I hear that they can detect pregnancy before a home test. Is this right and if so how long should I wait for accurate results?

Yes it is true. I’m sure it’s a little faster than a home pregnancy test but i got told by one of my OB’s that you can’t get a positive until your 4-6 weeks.
yes they can
they can detect pregnancy as early as ten days after conception
A blood test can detect as early as 4 weeks and a urine test as early as 6 weeks.
I believe that a blood test can show resolts two weeks after conception. And yes they will detect it before a home test will.
As early as 10 days after conception, definitely by the time you’ve missed your period.
A blood test will show if you are pregnant or not 7 days following conception.