Can Ohio employers fire me for getting pregnant?

In Ohio, employees generally cannot be fired simply because they become pregnant.  The Ohio Revised Code provides that it is an unlawful discriminatory practice:
 
For any employer, because of the race, color, religion, sex, military status, national origin, disability, age, or ancestry of any person, to discharge without just cause, to refuse to hire, or otherwise to discriminate against that person with respect to hire, tenure, terms, conditions, or privileges of employment, or any matter directly or indirectly related to employment.
R.C. § 4112.02
 
Federal Law may also protect pregnant employees via The Pregnany Discrimnation Act of 1978. 
ttps://www.eeoc.gov/laws/statutes/pregnancy.cfm
 
After childbirth, a woman may also be entitled to time off, if she qualifies for leave under the Family and Medical Leave Act (“FMLA”). Moreover, upon returning to work, employers must provide nursing mothers with a private room with a lock, that is not a bathroom, to pump breast milk. Your employer cannot discriminate or retaliate against you for requesting accommodations to pump milk.
           
In short, the law does have protection for pregnant employees.  However, those protections are routinely tested by employers around the State.