Do women who live in close proximity become pregnant at the same time?
Whereas human sociosexual behaviour is mostly dependent upon visual cues, when in close proximity smells may also play a role.
Pheromones are natural scents, produced in sweat especially from the armpits which play an important role in attracting the opposite sex for mating. Pheromones, may also affect women who stay together by controlling the timing of their ovulation hence synchronising their menstrual cycles as well as influencing when they get pregnant.
Getting pregnant around the same time requires the women to be intimate around the same time. It is a scientific fact that women of childbearing age who dwell in close proximity, all factors being equal, may get pregnant and even deliver around the same time.