Pregnancy is one of the most vulnerable times for a woman. A study in 2015 found out that people who are completely economically dependent on their spouses are more likely to be unfaithful.
Men are less likely to cheat if they make more money than their spouses. Studies from the Journal of Social and Personal Relationships estimate that the average person of the opposite sex has a 42% chance to cheat on their partner.
Here is everything you might need to know about paternity testing, even while pregnant: