I am pcos pregnant woman did gestational diabetes test (glucose after 1 hr) & fasting glucose test after fasting for 13 hrs, will this affect result?

Sounds ok. 1) you'd want to do glucose testing if PCOS 2) at least 10 hr fast 3) gluocse pre and one hr post is standard http://www.nerdpocalypse.net/PCOS.html.