PIO Shot Question

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PIO injections start today!!

I asked my doctor about IF we pull back on the plunger and see a little blood when doing the shot, do we have to discard the PIO and start over, or is it ok to inject with a little blood in it? They responded that they don’t pull back to check for blood anymore and we should just stick it and inject. 😬

First timer here so no idea if this is normal or not - can anyone share their knowledge/experience with this?? Helppp!