Researchers at Israel’s Weizmann Institute have discovered that women who suffer repeated pregnancy loss (uRPL) process messages concerning male body odor in a different way than other women. Brain scans reveal they have smaller olfactory bulbs – the initial brain-relay for smell.

https://wis-wander.weizmann.ac.il/life-sciences/repeated-pregnancy-loss-may-be-tied-olfactory-system