Thus, spotting after ovulation belongs to the so-called early pregnancy signs, occurring before hCG tests can show positive results and before you know about future period delay. When fertilized egg starts to embed into the uterine wall, it excretes ferments, melting surrounding tissues so that future embryo can attach itself to the womb. Certainly, these ferments may damage minor blood vessels. Sometimes no damage happens and a lady has no idea what a great action is taking place inside her organism. Blastocyst embedment lasts for 40 hours, consequently, spotting can’t continue any longer.