Low Pappa-a, your experience?

Nin

Hi ladies, I've posted it in general pregnancy but I think it got lost in before anyone could even read it...

I got my 12w results back, overall it came negative but my Pappa-a is low 0.41. Doctor said it might be nothing or might be a problem. The possible outcome is restricted baby growth and preaclampsia (not sure in spelling), but there is only 1 in 20 chance...

Have any one experienced low Pappa-a previously?