My wife had an iui on the 11 th of september, since then she was on Folg1 and ecospirin tab, also she had been given vageston to be used twice a day. Today is the 18th day after IUI, and we did a pregnancy test using test kit, which returned negative results. Usually she has her periods three days in advance, where she had her last one on the 1st of September. I therefore want to ask, is it normal for her to have delayed periods, or there is some thing to worry ?