Help Please! Is 21 dpo too late for implantation bleeding?

As
I am officially 3 weeks past ovulation today and have had several positive pregnancy test. I went to the hospital for spotting yesterday and the nurse told me I'm five weeks pregnant. A tech did an ultrasound and showed me what she thought could be the gestational sac but never really confirmed it. I have to go back in two days to test for beta testing. Could the spotting be implantation bleeding? Or is it too late for that? Please help me before I run myself sick.

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