Jan 19, 2012 · Pregnancy is far more likely to occur when the sperm is placed directly inside the womb so that it does not have to find its own way. The implantation symptoms after an IUI procedure are not different from what the symptoms would have been in a normal pregnancy. If the IUI procedure has been a success, implantation bleeding after IUI may occur. Last updated on July 28th, 2018 at 04:33 am. Question: Why is period 3 days late? What symptoms to expect if I am pregnant? If you’ve not planned for a baby, having to wait for your menstrual period for 3 days can be upsetting.