Ok, I finally found what I was looking for: This is a quote taken from Puff in the Why Dark Meat thread.
The effects of magnetic fields also have been observed at a cellular level. A researcher at Cal Tech in Pasadena, California hypothesized that individual cells may possess sensory systems that respond to weak magnetic fields. He noticed that extremely low frequency (ELF) electromagnetic fields change the cellular protein structures, which disrupts the transport of proteins and other substances within the cells. Clearly, disruption of the magnetic field of a cell may ultimately disable it to some degree, and may even cause cell death.
If the body's defenses are not able to neutralize abnormal external magnetic fields, many serious things can happen. Magnetic field exposure could lead to distortion in the cellular production of hormones, various cellular dysfunctions and ultimately, cell death.
Externally created magnetic fields can also interfere with normal cellular activity by creating a "static" that interferes with communication between separate cells and structures within cells. This type of exposure has been seen to interfere with the cell's ability to block disease-causing proteins. Thus, the cell may become more vulnerable to disease-causing invaders such as viruses and bacteria, and to the acceptance of toxic substances.
What I highlighted in red, is what I found most interesting about the info from Puff's source. The sperm and the egg needed for conception are both considered individual cells. Maybe this "static" is what is causing the problem with the pregnancies?