The period is the release of the endometrium of the previous cycle, and takes place when there was no embryo implantation. Thus, usually there is no pregnancy if you are on your period.
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Bachelor's Degree in Biotechnology from the Pablo de Olavide University (UPO) of Seville, Spain. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI). Experience at IVF, andrology, and general analysis laboratories. Embryologist specialized in Assisted Reproduction.