subtle signs of pregnancy discrimination or losing my mind?

I'm a manager for a popular restaurant chain. I've been with the company almost one year and have moved up fairly quickly. I started in a lower position and was promoted almost right away. Everything was going great...Until the day I revealed that I was newly pregnant. Suddenly I was transferred to another (less desirable and poorly operated) store. Two weeks later, I was again transferred to a store that has a history of not being able to retain managers at my level. Not long after starting, I was accused of being $400 short in my cash. Never had these issues in any other store. A few days later, I was accused of not locking the store down or setting the security alarm. Very odd and very sensitive details to miss. Am I losing my mind or does it seem like pregnancy discrimination at one of its most subtle forms?