Coming back from maternity leave..

I recently caught some lady’s I work with taking about me behind my back. I could tell it was me because I just came back from maternity leave and they always looking right at me whenever I walk into the room. Standing out smoking and whispering all the time. I’m a very emotional person since having my son and I am very sensitive to certain things. How would you deal with this ? I know people say oh people will talk but come on..Not in front of the person!! Today I almost cussed the lady out and even possibly would have been bad to do that but one of them is a manager who’s still acting like a child. I’ve very easy going and Christian is the only thing that stops me from loosing it on them..How do you deal with a negative person that just keeps on?? It’s really hard to face them when they smile at me likes its all good.. Help I suggestions What would you do?