My last period date is 1/09/2013 I am trying baby but my gyn said deviry 10 mg tablet taken in 17/09/2013 so my query is this tablet is secure for getting pregnant

You don't trust your gyn? If you have concerns discuss it with your physician.

Here is info on this med: Deviry Tablets | Deviry 10 mg | Deviry Side Effects

Its not listed as treatment for infertility but may be used to regulate your periods which could mean better pinpointing of ovulation.