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the size of the follicle and the endometrail thickness are the factors which decide when the follicle wil rupture. your wife's follicle can rupture now also. get a sonography
done one day after the previous one. also keep getting the sonography done till the follicle ruptures, sometimes it ruptuters late. you should know when in the cycle,which day the follicle ruptures. this will help in deciding further management. relax. a follicle that ruptures late does not usually produce a good quality egg. if that is the case you will nedd some medication to bring about ovulation. realx ,first study one natural cycle.