New job

Becca
Hi ladies!  I was wondering what your opinions might be on this... I got laid off from my job in February, 3 days later I found out I was pregnant (only 3wks!).  I started interviewing with this company, and had my last interview in March when I was 10wks pregnant.  I didn't mention the pregnancy during the process and wouldn't have been comfortable doing so as I hadn't even told friends.  They just barely offered me the job! I'm very excited as I need a job and really wanted this one, but now I'm stressed.  The start date isn't until May 26th when I will be in a giant group training (75people) for a launch of a company.  I don't like feeling like I'm lying about my pregnancy, but don't know what to do!  I plan to take 8wks off which would be covered by short term disability, then I would come right back to work.  I can't risk not having a job as we need the money so don't want to tell before my start date, but feel like it will be weird to show up to training obviously pregnant with my manager having no idea.  What do you girls think?  Should I go and "conceal" until after training is over?  Try to talk to the manager while I'm there?  Other ideas?  
I wish pregnancy were more "ok" in the working world!!!!