Hormonal bleed or period

CP
<a href="https://glowing.com/glow-fertility-program">Ivf</a> didnt work due to no egga at retrieval as trigger pen may be faulty or maybe not given properly. My question is post surgery 5 days later had a period like bleed only to be told it was a hormonal bleed & not my period. So confused if any can shed some light. Thanks