Hi there, I have understood your concern. I will suggest you the best possible treatment options. 1 ) First of all all do not panic. 2 ) As you might be aware that pregnancy occurs aaround the day of ovulation, and then fertilised egg travels from fallopian tubes to the womb. And after 7 to 10 days it implants in the uterus. 3 ) In some women there is some kind of blood satined discharge , known as implantation bleeding. Usually, it is very minimal and stops on its own. What you must have noticed xanthine be the same. And blackish or brownish coloration can be due to old and altered bleeding. So If There Is no fresh red bleeding, then you need not worry. Please be relaxed. Wait for 14 days after the IUI. If you happen to cross your expected date of cycle, then please get morning s first sample of urine tested for pregnancy. In case of doubt blood beta HCG test and USG will be be of help. I hope this answer helps you. Thanks. May God bless you with a bundle of joy. Thanks. Dr. Purushottam Neurgaonkar.