How soon can your doctor do a pregnancy test?

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Home pregnancy tests are best after a missed period, but what about a doctors blood test? How accurate are those when the period is still 2-3 weeks away?

Blood tests are much more sensitive and are accurate as early as 8 days past ovulation
2-3 weeks prior to her period a blood test would be accurate
Yes blood tests are more accurate, but the timeline you mention is ovulation time, way, way, way too early for any test