Afp quad test at 17wks . Now again . Confused

Rr • Between love and hate . I choose love . Spread it even if you dont get it back.
Hi
I got call from my obgyn that they need more blood for afp quad test ? 
Should i be worried ?
They already draw blood for quad sceen a week before .
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.
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Have this happen to anyone n wot was the reason ? 

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