1. Continuing metformin throughout pregnancy in women with polycystic ovary syndrome appears to safely reduce first-trimester spontaneous abortion: a pilot study 
C.J Glueck, M.D., Harvey Phillips, M.D., Dan Cameron, M.D., Luann Sieve-Smith, B.A., Ping Wang, Ph.D. 
Fertility and Sterility 
Volume 75, Issue 1, Pages (January 2001)
DOI: /S (00)

2. Figure 1
Current (during metformin therapy) and previous (while not receiving metformin) first-trimester spontaneous abortions and live births in 10 women with the polycystic ovary syndrome who had 22 previous pregnancies. P<.002, Fisher exact test.
Glueck. Metformin throughout pregnancy and PCOS. Fertil Steril 2001.
Fertility and Sterility  , 46-52DOI: ( /S (00) )