Diane 35 and pregnancy?

My wife has been taking diane 35 for about 10 months. She used to take it for facial hair removal and period regulation. She stops it once each month to get her period and continues it on the 5th day of the period. Now this is our first month of marriage and we arenot planning on having kids soon. She stopped the pills last Friday and now she is getting her cycle. She will resume the pills in the coming days. How soon after she resumes can we have again without her being pregnant?