Atleast 15 days after IUI we can do a pregnancy test. It depends on the ovulation. Suppose if you have missed your periods you can do a pregnancy test. In IUI sometime you ovulate soon. If you ovulate on the 8th day, 8 plus 15 will be 23. So you don’t have to cross your dates to know if you are pregnant. A blood test is more specific than a urine pregnancy test. so all these deposits are important when you do an IUI to know when you will get your pregnancy test positive, but ideally you should wait for atleast 15 days to know whether you are pregnant or not. Suppose the urine pregnancy test comes negative after 15 days, you can wait for 5 days more and repeat the pregnancy test. Sometimes pregnancy test doesn’t detect pregnancy even the urine test doesn’t detect, even a sonography may not detect. So I you don’t get your periods, then wait and then again recheck your pregnancy test because sometimes there isolate conception. So you should not be unhappy. You should always be positive and do the test again. Suppose you cross more than 40 days then you have to do a repeat checkup and then find out why it is not happening.