It is extremely unlikely. If superfetation takes place, it does a few weeks apart due to alterations in the regulation of hormones at the beginning of pregnancy. Moreover, the second pregnancy would be unsustainable after delivery of the first child.
Can you get pregnant in your third trimester?
By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 07/13/2018
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)