The period is the detachment of the endometrium from the previous cycle and occurs when there has been no implantation of an embryo, therefore, in general, if you have a period there is no pregnancy.
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Sara Salgado
B.Sc., M.Sc.
Embryologist
Degree in Biochemistry and Molecular Biology from the University of the Basque Country (UPV/EHU). Master's Degree in Human Assisted Reproduction from the Complutense University of Madrid (UCM). Certificate of University Expert in Genetic Diagnosis Techniques from the University of Valencia (UV).