I am so friggin mad at this girl at work

Well I have made some comments about a girl at work that is pregnant. I work in house assisting mentally handicap people and we have many houses in the agency. Well my house didnt tell me she was pregnant at first. I started asking why they were sending her to other houses and one of the staff let it slip that she was pregnant. I dont know if she asked to work at other houses or they sent her to these houses because they didnt know how I would feel about working with her. My boss was/is my sons Godfather so it was a big loss to him too. Anyhow I am really tight with the assist manager. He too is taking my loss hard. The first day we worked together for only 30 mins and he started crying when I said my sons name. Tonight was the first time we work a shift togther since I have been back. We were in the bathroom alone with one of the residents changing his clothes cause he soiled himself cause he was mad, and I brought up the pregnant staff member to him. He got this angry look on his face and said" I hope they get rid of her. She is a real peice of work". I asked him what he was talking about. He told me not to say anything cause they dont know all the facts yet but I can say it on here cause I need to say it outloud and this is the best place to vent for me right now. Anyhow I asked him what was going on.he said" well we dont really know if she is pregnant. She requested time off this month awhile back to go on a cruise but was denied. You were pregnant and lost your son and was told by the company that you could take off as much time as you need to recover and heal from this." at this point I saw were this was heading and I could just feel the anger building up deep down inside the pit of my stomach. he continued to say" well she told us she was pregant right after you lost Max but she didnt want a baby so she was goin to abort it so she will need time off to recover.She hasnt brought in a doctor note stating she is pregnant yet so we can only go her word right now, but I tell you what if she comes in here and says she "lost" the baby  then there are goin to be some trouble cause either she wasnt pregnant in the first place or aborted it. All she wants is time off for her damn cruise".. I was shaking so bad at this point all that came out of my mouth was" If she comes back to this house I swear to God I will take her ass down." Im a nice person and I dont threaten people and felt sick that thats all I could say. She is the most discusting scumbag I have ever met if all this is true. To take my horrible situation and try to use it to her advantage. I dont have any clue how to come face to face with her again if this is true and not take everything inside of me not to hurt her. I am just lost for words right now on what to say to her if she comes back.