Teachers who are pregnant?

Nicole
Hi, this is my second time pregnant, suffered a miscarriage over the summer. School just started up and I am so nervous something is going to happen while I'm teaching and alone with the kids. 
Also looking for tips from other teachers  who teach all day with limited access to the bathroom. 
And maternity leave sub plans! Ahhhhhhhh! I have a little while to go before I need to worry about that, but it's already on my mind.