Am I over reacting??

So not sure if I am over reacting or its the hormones or what but here is the situation. A coworker is leaving on Friday and a different worker is going to be taking over her cubicle near mine. The new person moving over has a history of coming to work sick. Like she was sick (COVID symptoms) on and off since May. She tested positive for COVID a couple months ago. She is back again and let's just say my work place doesn't think this whole COVID thing is real or serious. Am I right to be upset that she will be moving near me especially when I am so close to the end of my pregnancy or am i over reacting?? I don't know what the research, if there is much, about getting COVID a second time.