A lot of times there are problems with non- identified "miss- growth" and "narrowing" of the fallopian tubes. Through false nerve impulses from the vertebral, the muscle from the fallopian tubes can't "let go".
Through the adjustment of the lumbar spine, the plexus reacts, the muscle of the fallopian tubes relaxes and a normal egg transport is again possible and with that the bases for a pregnancy.
Magic? No, just often overlooked muscular Neurophysiologie. Chiropractic can help here.