Immediately after an IUI, you may experience mild cramping though this may be due to ovulation. In the next 6-12 days, the fertilized egg travels through the fallopian tubes and implants into the uterus. And around 7 days after ovulation, you may experience early pregnancy symptoms like nausea, sore breasts, tender nipples, implantation bleeding, and headaches. You can take a pregnancy test as early as 1-2 weeks after implantation, or for best results after your first missed period.