Can a pregnancy test detect at 3 weeks? Check your hCG timeline.
At 3 weeks gestational age (1 week post-ovulation), implantation is just occurring. hCG production begins after implantation (~9 DPO) and doubles every 48 hours. At 3 weeks, hCG is typically < 5 mIU/mL – below most test thresholds. By 4 weeks (14 DPO), hCG reaches ~50–100 mIU/mL, making detection reliable.