IAnything to worry about my Double Marker report?

Patient: Hi doc,I am 28. My USG report on 10th week was normal. As per my doctor’s advice, i have done my double marker test and the results are as follows:Free Beta HCG, Serum by CLIA : 87.70 ng/mlPAPPa by CLIA, Serum : 2.46 mIU/mlDown’s syndrome screening results:Trisomy 21 risk : 1:3698Age risk : 1:707Trisomy 13/18 :Is there anything to worry about? What are the normal reference ranges?Thanks in advance.