Work in a school and pregnant

Just wondering if anyone is in a similar situation. I am currently 11 weeks pregnant and I work in a primary school. I have been on Xmas hols for the past 2 weeks but due back on Monday.

I’m getting more and more anxious about the new virus strain as social distancing is not really possible and we don’t wear masks etc. Work don’t know I am pregnant yet so not sure whether to tell them this early on as I know they will have to put a risk assessment in place for me.

Just wondering if anyone is in a similar position or working ‘on the front line’ while pregnant? I know official guidance says we are not classed as vulnerable until 3rd trimester but new strain is highly transmissible 😣